homework-jianmu/tests/army/query/function/ans/substr.csv

1	taos> select SUBSTRING('Hello.World!', 1)
2	substring('Hello.World!', 1) |
3	===============================
4	Hello.World! |
5	taos> select SUBSTRING('Hello.World!', 1, 5)
6	substring('Hello.World!', 1, 5) |
7	==================================
8	Hello |
9	taos> select SUBSTRING('Hello.World!', 1, 20)
10	substring('Hello.World!', 1, 20) |
11	===================================
12	Hello.World! |
13	taos> select SUBSTRING('Hello.World!' FROM 1)
14	substring('Hello.World!' from 1) |
15	===================================
16	Hello.World! |
17	taos> select SUBSTRING('Hello.World!' FROM 1 FOR 5)
18	substring('Hello.World!' from 1 for 5) |
19	=========================================
20	Hello |
21	taos> select SUBSTRING('Hello.World!' FROM 1 FOR 20)
22	substring('Hello.World!' from 1 for 20) |
23	==========================================
24	Hello.World! |
25	taos> select SUBSTRING('Hello.World!', -6)
26	substring('Hello.World!', -6) |
27	================================
28	World! |
29	taos> select SUBSTRING('Hello.World!', -6, 5)
30	substring('Hello.World!', -6, 5) |
31	===================================
32	World |
33	taos> select SUBSTRING('Hello.World!', -6, 20)
34	substring('Hello.World!', -6, 20) |
35	====================================
36	World! |
37	taos> select SUBSTRING('Hello.World!' FROM -6)
38	substring('Hello.World!' from -6) |
39	====================================
40	World! |
41	taos> select SUBSTRING('Hello.World!' FROM -6 FOR 5)
42	substring('Hello.World!' from -6 for 5) |
43	==========================================
44	World |
45	taos> select SUBSTRING('Hello.World!' FROM -6 FOR 20)
46	substring('Hello.World!' from -6 for 20) |
47	===========================================
48	World! |
49	taos> select SUBSTRING('北京涛思数据科技有限公司，tdengine.', 1)
50	substring('北京涛思数据科技有限公司，tdengine.', 1) |
51	===================================================================
52	北京涛思数据科技有限公司，tdengine. |
53	taos> select SUBSTRING('北京涛思数据科技有限公司，tdengine.', 1, 5)
54	substring('北京涛思数据科技有限公司，tdengine.', 1, |
55	===================================================================
56	北京涛思数 |
57	taos> select SUBSTRING('北京涛思数据科技有限公司，tdengine.', 1, 20)
58	substring('北京涛思数据科技有限公司，tdengine.', 1, |
59	===================================================================
60	北京涛思数据科技有限公司，tdengin |
61	taos> select SUBSTRING('北京涛思数据科技有限公司，tdengine.' FROM 1)
62	substring('北京涛思数据科技有限公司，tdengine.' fro |
63	===================================================================
64	北京涛思数据科技有限公司，tdengine. |
65	taos> select SUBSTRING('北京涛思数据科技有限公司，tdengine.' FROM 1 FOR 5)
66	substring('北京涛思数据科技有限公司，tdengine.' fro |
67	===================================================================
68	北京涛思数 |
69	taos> select SUBSTRING('北京涛思数据科技有限公司，tdengine.' FROM 1 FOR 20)
70	substring('北京涛思数据科技有限公司，tdengine.' fro |
71	===================================================================
72	北京涛思数据科技有限公司，tdengin |
73	taos> select SUBSTRING('北京涛思数据科技有限公司，tdengine.', -6)
74	substring('北京涛思数据科技有限公司，tdengine.', -6 |
75	===================================================================
76	ngine. |
77	taos> select SUBSTRING('北京涛思数据科技有限公司，tdengine.', -6, 5)
78	substring('北京涛思数据科技有限公司，tdengine.', -6 |
79	===================================================================
80	ngine |
81	taos> select SUBSTRING('北京涛思数据科技有限公司，tdengine.', -6, 20)
82	substring('北京涛思数据科技有限公司，tdengine.', -6 |
83	===================================================================
84	ngine. |
85	taos> select SUBSTRING('北京涛思数据科技有限公司，tdengine.' FROM -6)
86	substring('北京涛思数据科技有限公司，tdengine.' fro |
87	===================================================================
88	ngine. |
89	taos> select SUBSTRING('北京涛思数据科技有限公司，tdengine.' FROM -6 FOR 5)
90	substring('北京涛思数据科技有限公司，tdengine.' fro |
91	===================================================================
92	ngine |
93	taos> select SUBSTRING('北京涛思数据科技有限公司，tdengine.' FROM -6 FOR 20)
94	substring('北京涛思数据科技有限公司，tdengine.' fro |
95	===================================================================
96	ngine. |
97	taos> select SUBSTRING(nch1, 1) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
98	substring(nch1, 1) |
99	=================================
100	一二三四五六七八九十 |
101	prision |
102	一二三四五六七八九十 |
103	prision |
104	abc一二三abc一二三abc |
105	taos> select SUBSTRING(nch1, 1, 5) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
106	substring(nch1, 1, 5) |
107	=================================
108	一二三四五 |
109	prisi |
110	一二三四五 |
111	prisi |
112	abc一二 |
113	taos> select SUBSTRING(nch1, 1, 20) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
114	substring(nch1, 1, 20) |
115	=================================
116	一二三四五六七八九十 |
117	prision |
118	一二三四五六七八九十 |
119	prision |
120	abc一二三abc一二三abc |
121	taos> select SUBSTRING(nch1 FROM 1) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
122	substring(nch1 from 1) |
123	=================================
124	一二三四五六七八九十 |
125	prision |
126	一二三四五六七八九十 |
127	prision |
128	abc一二三abc一二三abc |
129	taos> select SUBSTRING(nch1 FROM 1 FOR 5) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
130	substring(nch1 from 1 for 5) |
131	=================================
132	一二三四五 |
133	prisi |
134	一二三四五 |
135	prisi |
136	abc一二 |
137	taos> select SUBSTRING(nch1 FROM 1 FOR 20) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
138	substring(nch1 from 1 for 20) |
139	=================================
140	一二三四五六七八九十 |
141	prision |
142	一二三四五六七八九十 |
143	prision |
144	abc一二三abc一二三abc |
145	taos> select SUBSTRING(nch1, -6) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
146	substring(nch1, -6) |
147	=================================
148	五六七八九十 |
149	rision |
150	五六七八九十 |
151	rision |
152	一二三abc |
153	taos> select SUBSTRING(nch1, -6, 5) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
154	substring(nch1, -6, 5) |
155	=================================
156	五六七八九 |
157	risio |
158	五六七八九 |
159	risio |
160	一二三ab |
161	taos> select SUBSTRING(nch1, -6, 20) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
162	substring(nch1, -6, 20) |
163	=================================
164	五六七八九十 |
165	rision |
166	五六七八九十 |
167	rision |
168	一二三abc |
169	taos> select SUBSTRING(nch1 FROM -6) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
170	substring(nch1 from -6) |
171	=================================
172	五六七八九十 |
173	rision |
174	五六七八九十 |
175	rision |
176	一二三abc |
177	taos> select SUBSTRING(nch1 FROM -6 FOR 5) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
178	substring(nch1 from -6 for 5) |
179	=================================
180	五六七八九 |
181	risio |
182	五六七八九 |
183	risio |
184	一二三ab |
185	taos> select SUBSTRING(nch1 FROM -6 FOR 20) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
186	substring(nch1 from -6 for 20) |
187	=================================
188	五六七八九十 |
189	rision |
190	五六七八九十 |
191	rision |
192	一二三abc |
193	taos> select SUBSTRING(var1, 1) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
194	substring(var1, 1) |
195	=================================
196	一二三四五六七八九十 |
197	prision |
198	prision |
199	abc一二三abc一二三abc |
200	一二三123321三二一 |
201	taos> select SUBSTRING(var1, 1, 5) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
202	substring(var1, 1, 5) |
203	=================================
204	一二三四五 |
205	prisi |
206	prisi |
207	abc一二 |
208	一二三12 |
209	taos> select SUBSTRING(var1, 1, 20) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
210	substring(var1, 1, 20) |
211	=================================
212	一二三四五六七八九十 |
213	prision |
214	prision |
215	abc一二三abc一二三abc |
216	一二三123321三二一 |
217	taos> select SUBSTRING(var1 FROM 1) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
218	substring(var1 from 1) |
219	=================================
220	一二三四五六七八九十 |
221	prision |
222	prision |
223	abc一二三abc一二三abc |
224	一二三123321三二一 |
225	taos> select SUBSTRING(var1 FROM 1 FOR 5) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
226	substring(var1 from 1 for 5) |
227	=================================
228	一二三四五 |
229	prisi |
230	prisi |
231	abc一二 |
232	一二三12 |
233	taos> select SUBSTRING(var1 FROM 1 FOR 20) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
234	substring(var1 from 1 for 20) |
235	=================================
236	一二三四五六七八九十 |
237	prision |
238	prision |
239	abc一二三abc一二三abc |
240	一二三123321三二一 |
241	taos> select SUBSTRING(var1, -6) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
242	substring(var1, -6) |
243	=================================
244	五六七八九十 |
245	rision |
246	rision |
247	一二三abc |
248	321三二一 |
249	taos> select SUBSTRING(var1, -6, 5) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
250	substring(var1, -6, 5) |
251	=================================
252	五六七八九 |
253	risio |
254	risio |
255	一二三ab |
256	321三二 |
257	taos> select SUBSTRING(var1, -6, 20) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
258	substring(var1, -6, 20) |
259	=================================
260	五六七八九十 |
261	rision |
262	rision |
263	一二三abc |
264	321三二一 |
265	taos> select SUBSTRING(var1 FROM -6) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
266	substring(var1 from -6) |
267	=================================
268	五六七八九十 |
269	rision |
270	rision |
271	一二三abc |
272	321三二一 |
273	taos> select SUBSTRING(var1 FROM -6 FOR 5) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
274	substring(var1 from -6 for 5) |
275	=================================
276	五六七八九 |
277	risio |
278	risio |
279	一二三ab |
280	321三二 |
281	taos> select SUBSTRING(var1 FROM -6 FOR 20) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
282	substring(var1 from -6 for 20) |
283	=================================
284	五六七八九十 |
285	rision |
286	rision |
287	一二三abc |
288	321三二一 |
289	taos> select SUBSTRING(nch1, sign(id), 1) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
290	substring(nch1, sign(id), 1) |
291	=================================
292	一 |
293	p |
294	一 |
295	p |
296	a |
297	taos> select SUBSTRING(nch1, sign(id), 5) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
298	substring(nch1, sign(id), 5) |
299	=================================
300	一二三四五 |
301	prisi |
302	一二三四五 |
303	prisi |
304	abc一二 |
305	taos> select SUBSTRING(nch1, sign(id), 20) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
306	substring(nch1, sign(id), 20) |
307	=================================
308	一二三四五六七八九十 |
309	prision |
310	一二三四五六七八九十 |
311	prision |
312	abc一二三abc一二三abc |
313	taos> select SUBSTRING(nch1 FROM sign(id)) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
314	substring(nch1 from sign(id)) |
315	=================================
316	一二三四五六七八九十 |
317	prision |
318	一二三四五六七八九十 |
319	prision |
320	abc一二三abc一二三abc |
321	taos> select SUBSTRING(nch1 FROM sign(id) FOR 5) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
322	substring(nch1 from sign(id) for 5) |
323	======================================
324	一二三四五 |
325	prisi |
326	一二三四五 |
327	prisi |
328	abc一二 |
329	taos> select SUBSTRING(nch1 FROM sign(id) FOR 20) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
330	substring(nch1 from sign(id) for 20) |
331	=======================================
332	一二三四五六七八九十 |
333	prision |
334	一二三四五六七八九十 |
335	prision |
336	abc一二三abc一二三abc |
337	taos> select SUBSTRING(var1, sign(id), 1) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
338	substring(var1, sign(id), 1) |
339	=================================
340	一 |
341	p |
342	p |
343	a |
344	一 |
345	taos> select SUBSTRING(var1, sign(id), 5) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
346	substring(var1, sign(id), 5) |
347	=================================
348	一二三四五 |
349	prisi |
350	prisi |
351	abc一二 |
352	一二三12 |
353	taos> select SUBSTRING(var1, sign(id), 20) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
354	substring(var1, sign(id), 20) |
355	=================================
356	一二三四五六七八九十 |
357	prision |
358	prision |
359	abc一二三abc一二三abc |
360	一二三123321三二一 |
361	taos> select SUBSTRING(var1 FROM sign(id)) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
362	substring(var1 from sign(id)) |
363	=================================
364	一二三四五六七八九十 |
365	prision |
366	prision |
367	abc一二三abc一二三abc |
368	一二三123321三二一 |
369	taos> select SUBSTRING(var1 FROM sign(id) FOR 5) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
370	substring(var1 from sign(id) for 5) |
371	======================================
372	一二三四五 |
373	prisi |
374	prisi |
375	abc一二 |
376	一二三12 |
377	taos> select SUBSTRING(var1 FROM sign(id) FOR 20) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
378	substring(var1 from sign(id) for 20) |
379	=======================================
380	一二三四五六七八九十 |
381	prision |
382	prision |
383	abc一二三abc一二三abc |
384	一二三123321三二一 |
385	taos> select SUBSTRING(nch1, 2, id) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
386	substring(nch1, 2, id) |
387	=================================
388	二 |
389	ris |
390	二三四五六七八 |
391	rision |
392	bc一二三abc一二三a |
393	taos> select SUBSTRING(nch1 FROM 2 FOR id) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
394	substring(nch1 from 2 for id) |
395	=================================
396	二 |
397	ris |
398	二三四五六七八 |
399	rision |
400	bc一二三abc一二三a |
401	taos> select SUBSTRING(var1, 2, id) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
402	substring(var1, 2, id) |
403	=================================
404	二三四五 |
405	rision |
406	rision |
407	bc一二三abc一二三a |
408	二三123321三二一 |
409	taos> select SUBSTRING(var1 FROM 2 FOR id) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
410	substring(var1 from 2 for id) |
411	=================================
412	二三四五 |
413	rision |
414	rision |
415	bc一二三abc一二三a |
416	二三123321三二一 |
417	taos> select SUBSTR('Hello.World!', 1)
418	substr('Hello.World!', 1) |
419	============================
420	Hello.World! |
421	taos> select SUBSTR('Hello.World!', 1, 5)
422	substr('Hello.World!', 1, 5) |
423	===============================
424	Hello |
425	taos> select SUBSTR('Hello.World!', 1, 20)
426	substr('Hello.World!', 1, 20) |
427	================================
428	Hello.World! |
429	taos> select SUBSTR('Hello.World!' FROM 1)
430	substr('Hello.World!' from 1) |
431	================================
432	Hello.World! |
433	taos> select SUBSTR('Hello.World!' FROM 1 FOR 5)
434	substr('Hello.World!' from 1 for 5) |
435	======================================
436	Hello |
437	taos> select SUBSTR('Hello.World!' FROM 1 FOR 20)
438	substr('Hello.World!' from 1 for 20) |
439	=======================================
440	Hello.World! |
441	taos> select SUBSTR('Hello.World!', -6)
442	substr('Hello.World!', -6) |
443	=============================
444	World! |
445	taos> select SUBSTR('Hello.World!', -6, 5)
446	substr('Hello.World!', -6, 5) |
447	================================
448	World |
449	taos> select SUBSTR('Hello.World!', -6, 20)
450	substr('Hello.World!', -6, 20) |
451	=================================
452	World! |
453	taos> select SUBSTR('Hello.World!' FROM -6)
454	substr('Hello.World!' from -6) |
455	=================================
456	World! |
457	taos> select SUBSTR('Hello.World!' FROM -6 FOR 5)
458	substr('Hello.World!' from -6 for 5) |
459	=======================================
460	World |
461	taos> select SUBSTR('Hello.World!' FROM -6 FOR 20)
462	substr('Hello.World!' from -6 for 20) |
463	========================================
464	World! |
465	taos> select SUBSTR('北京涛思数据科技有限公司，tdengine.', 1)
466	substr('北京涛思数据科技有限公司，tdengine.', 1) |
467	================================================================
468	北京涛思数据科技有限公司，tdengine. |
469	taos> select SUBSTR('北京涛思数据科技有限公司，tdengine.', 1, 5)
470	substr('北京涛思数据科技有限公司，tdengine.', 1, 5) |
471	===================================================================
472	北京涛思数 |
473	taos> select SUBSTR('北京涛思数据科技有限公司，tdengine.', 1, 20)
474	substr('北京涛思数据科技有限公司，tdengine.', 1, 20 |
475	===================================================================
476	北京涛思数据科技有限公司，tdengin |
477	taos> select SUBSTR('北京涛思数据科技有限公司，tdengine.' FROM 1)
478	substr('北京涛思数据科技有限公司，tdengine.' from 1 |
479	===================================================================
480	北京涛思数据科技有限公司，tdengine. |
481	taos> select SUBSTR('北京涛思数据科技有限公司，tdengine.' FROM 1 FOR 5)
482	substr('北京涛思数据科技有限公司，tdengine.' from 1 |
483	===================================================================
484	北京涛思数 |
485	taos> select SUBSTR('北京涛思数据科技有限公司，tdengine.' FROM 1 FOR 20)
486	substr('北京涛思数据科技有限公司，tdengine.' from 1 |
487	===================================================================
488	北京涛思数据科技有限公司，tdengin |
489	taos> select SUBSTR('北京涛思数据科技有限公司，tdengine.', -6)
490	substr('北京涛思数据科技有限公司，tdengine.', -6) |
491	=================================================================
492	ngine. |
493	taos> select SUBSTR('北京涛思数据科技有限公司，tdengine.', -6, 5)
494	substr('北京涛思数据科技有限公司，tdengine.', -6, 5 |
495	===================================================================
496	ngine |
497	taos> select SUBSTR('北京涛思数据科技有限公司，tdengine.', -6, 20)
498	substr('北京涛思数据科技有限公司，tdengine.', -6, 2 |
499	===================================================================
500	ngine. |
501	taos> select SUBSTR('北京涛思数据科技有限公司，tdengine.' FROM -6)
502	substr('北京涛思数据科技有限公司，tdengine.' from - |
503	===================================================================
504	ngine. |
505	taos> select SUBSTR('北京涛思数据科技有限公司，tdengine.' FROM -6 FOR 5)
506	substr('北京涛思数据科技有限公司，tdengine.' from - |
507	===================================================================
508	ngine |
509	taos> select SUBSTR('北京涛思数据科技有限公司，tdengine.' FROM -6 FOR 20)
510	substr('北京涛思数据科技有限公司，tdengine.' from - |
511	===================================================================
512	ngine. |
513	taos> select SUBSTR(nch1, 1) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
514	substr(nch1, 1) |
515	=================================
516	一二三四五六七八九十 |
517	prision |
518	一二三四五六七八九十 |
519	prision |
520	abc一二三abc一二三abc |
521	taos> select SUBSTR(nch1, 1, 5) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
522	substr(nch1, 1, 5) |
523	=================================
524	一二三四五 |
525	prisi |
526	一二三四五 |
527	prisi |
528	abc一二 |
529	taos> select SUBSTR(nch1, 1, 20) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
530	substr(nch1, 1, 20) |
531	=================================
532	一二三四五六七八九十 |
533	prision |
534	一二三四五六七八九十 |
535	prision |
536	abc一二三abc一二三abc |
537	taos> select SUBSTR(nch1 FROM 1) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
538	substr(nch1 from 1) |
539	=================================
540	一二三四五六七八九十 |
541	prision |
542	一二三四五六七八九十 |
543	prision |
544	abc一二三abc一二三abc |
545	taos> select SUBSTR(nch1 FROM 1 FOR 5) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
546	substr(nch1 from 1 for 5) |
547	=================================
548	一二三四五 |
549	prisi |
550	一二三四五 |
551	prisi |
552	abc一二 |
553	taos> select SUBSTR(nch1 FROM 1 FOR 20) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
554	substr(nch1 from 1 for 20) |
555	=================================
556	一二三四五六七八九十 |
557	prision |
558	一二三四五六七八九十 |
559	prision |
560	abc一二三abc一二三abc |
561	taos> select SUBSTR(nch1, -6) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
562	substr(nch1, -6) |
563	=================================
564	五六七八九十 |
565	rision |
566	五六七八九十 |
567	rision |
568	一二三abc |
569	taos> select SUBSTR(nch1, -6, 5) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
570	substr(nch1, -6, 5) |
571	=================================
572	五六七八九 |
573	risio |
574	五六七八九 |
575	risio |
576	一二三ab |
577	taos> select SUBSTR(nch1, -6, 20) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
578	substr(nch1, -6, 20) |
579	=================================
580	五六七八九十 |
581	rision |
582	五六七八九十 |
583	rision |
584	一二三abc |
585	taos> select SUBSTR(nch1 FROM -6) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
586	substr(nch1 from -6) |
587	=================================
588	五六七八九十 |
589	rision |
590	五六七八九十 |
591	rision |
592	一二三abc |
593	taos> select SUBSTR(nch1 FROM -6 FOR 5) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
594	substr(nch1 from -6 for 5) |
595	=================================
596	五六七八九 |
597	risio |
598	五六七八九 |
599	risio |
600	一二三ab |
601	taos> select SUBSTR(nch1 FROM -6 FOR 20) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
602	substr(nch1 from -6 for 20) |
603	=================================
604	五六七八九十 |
605	rision |
606	五六七八九十 |
607	rision |
608	一二三abc |
609	taos> select SUBSTR(var1, 1) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
610	substr(var1, 1) |
611	=================================
612	一二三四五六七八九十 |
613	prision |
614	prision |
615	abc一二三abc一二三abc |
616	一二三123321三二一 |
617	taos> select SUBSTR(var1, 1, 5) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
618	substr(var1, 1, 5) |
619	=================================
620	一二三四五 |
621	prisi |
622	prisi |
623	abc一二 |
624	一二三12 |
625	taos> select SUBSTR(var1, 1, 20) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
626	substr(var1, 1, 20) |
627	=================================
628	一二三四五六七八九十 |
629	prision |
630	prision |
631	abc一二三abc一二三abc |
632	一二三123321三二一 |
633	taos> select SUBSTR(var1 FROM 1) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
634	substr(var1 from 1) |
635	=================================
636	一二三四五六七八九十 |
637	prision |
638	prision |
639	abc一二三abc一二三abc |
640	一二三123321三二一 |
641	taos> select SUBSTR(var1 FROM 1 FOR 5) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
642	substr(var1 from 1 for 5) |
643	=================================
644	一二三四五 |
645	prisi |
646	prisi |
647	abc一二 |
648	一二三12 |
649	taos> select SUBSTR(var1 FROM 1 FOR 20) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
650	substr(var1 from 1 for 20) |
651	=================================
652	一二三四五六七八九十 |
653	prision |
654	prision |
655	abc一二三abc一二三abc |
656	一二三123321三二一 |
657	taos> select SUBSTR(var1, -6) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
658	substr(var1, -6) |
659	=================================
660	五六七八九十 |
661	rision |
662	rision |
663	一二三abc |
664	321三二一 |
665	taos> select SUBSTR(var1, -6, 5) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
666	substr(var1, -6, 5) |
667	=================================
668	五六七八九 |
669	risio |
670	risio |
671	一二三ab |
672	321三二 |
673	taos> select SUBSTR(var1, -6, 20) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
674	substr(var1, -6, 20) |
675	=================================
676	五六七八九十 |
677	rision |
678	rision |
679	一二三abc |
680	321三二一 |
681	taos> select SUBSTR(var1 FROM -6) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
682	substr(var1 from -6) |
683	=================================
684	五六七八九十 |
685	rision |
686	rision |
687	一二三abc |
688	321三二一 |
689	taos> select SUBSTR(var1 FROM -6 FOR 5) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
690	substr(var1 from -6 for 5) |
691	=================================
692	五六七八九 |
693	risio |
694	risio |
695	一二三ab |
696	321三二 |
697	taos> select SUBSTR(var1 FROM -6 FOR 20) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
698	substr(var1 from -6 for 20) |
699	=================================
700	五六七八九十 |
701	rision |
702	rision |
703	一二三abc |
704	321三二一 |
705	taos> select SUBSTR(nch1, sign(id), 1) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
706	substr(nch1, sign(id), 1) |
707	=================================
708	一 |
709	p |
710	一 |
711	p |
712	a |
713	taos> select SUBSTR(nch1, sign(id), 5) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
714	substr(nch1, sign(id), 5) |
715	=================================
716	一二三四五 |
717	prisi |
718	一二三四五 |
719	prisi |
720	abc一二 |
721	taos> select SUBSTR(nch1, sign(id), 20) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
722	substr(nch1, sign(id), 20) |
723	=================================
724	一二三四五六七八九十 |
725	prision |
726	一二三四五六七八九十 |
727	prision |
728	abc一二三abc一二三abc |
729	taos> select SUBSTR(nch1 FROM sign(id)) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
730	substr(nch1 from sign(id)) |
731	=================================
732	一二三四五六七八九十 |
733	prision |
734	一二三四五六七八九十 |
735	prision |
736	abc一二三abc一二三abc |
737	taos> select SUBSTR(nch1 FROM sign(id) FOR 5) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
738	substr(nch1 from sign(id) for 5) |
739	===================================
740	一二三四五 |
741	prisi |
742	一二三四五 |
743	prisi |
744	abc一二 |
745	taos> select SUBSTR(nch1 FROM sign(id) FOR 20) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
746	substr(nch1 from sign(id) for 20) |
747	====================================
748	一二三四五六七八九十 |
749	prision |
750	一二三四五六七八九十 |
751	prision |
752	abc一二三abc一二三abc |
753	taos> select SUBSTR(var1, sign(id), 1) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
754	substr(var1, sign(id), 1) |
755	=================================
756	一 |
757	p |
758	p |
759	a |
760	一 |
761	taos> select SUBSTR(var1, sign(id), 5) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
762	substr(var1, sign(id), 5) |
763	=================================
764	一二三四五 |
765	prisi |
766	prisi |
767	abc一二 |
768	一二三12 |
769	taos> select SUBSTR(var1, sign(id), 20) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
770	substr(var1, sign(id), 20) |
771	=================================
772	一二三四五六七八九十 |
773	prision |
774	prision |
775	abc一二三abc一二三abc |
776	一二三123321三二一 |
777	taos> select SUBSTR(var1 FROM sign(id)) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
778	substr(var1 from sign(id)) |
779	=================================
780	一二三四五六七八九十 |
781	prision |
782	prision |
783	abc一二三abc一二三abc |
784	一二三123321三二一 |
785	taos> select SUBSTR(var1 FROM sign(id) FOR 5) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
786	substr(var1 from sign(id) for 5) |
787	===================================
788	一二三四五 |
789	prisi |
790	prisi |
791	abc一二 |
792	一二三12 |
793	taos> select SUBSTR(var1 FROM sign(id) FOR 20) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
794	substr(var1 from sign(id) for 20) |
795	====================================
796	一二三四五六七八九十 |
797	prision |
798	prision |
799	abc一二三abc一二三abc |
800	一二三123321三二一 |
801	taos> select SUBSTR(nch1, 2, id) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
802	substr(nch1, 2, id) |
803	=================================
804	二 |
805	ris |
806	二三四五六七八 |
807	rision |
808	bc一二三abc一二三a |
809	taos> select SUBSTR(nch1 FROM 2 FOR id) from ts_4893.meters where char_length(nch1) > 6 order by ts limit 5
810	substr(nch1 from 2 for id) |
811	=================================
812	二 |
813	ris |
814	二三四五六七八 |
815	rision |
816	bc一二三abc一二三a |
817	taos> select SUBSTR(var1, 2, id) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
818	substr(var1, 2, id) |
819	=================================
820	二三四五 |
821	rision |
822	rision |
823	bc一二三abc一二三a |
824	二三123321三二一 |
825	taos> select SUBSTR(var1 FROM 2 FOR id) from ts_4893.meters where char_length(var1) > 6 order by ts limit 5
826	substr(var1 from 2 for id) |
827	=================================
828	二三四五 |
829	rision |
830	rision |
831	bc一二三abc一二三a |
832	二三123321三二一 |
833	taos> select substring('tdengine', 2)
834	substring('tdengine', 2) |
835	===========================
836	dengine |
837	taos> select substring('tdengine', 8)
838	substring('tdengine', 8) |
839	===========================
840	e |
841	taos> select substring('tdengine', 1, 3)
842	substring('tdengine', 1, 3) |
843	==============================
844	tde |
845	taos> select substring('tdengine', 2, 99)
846	substring('tdengine', 2, 99) |
847	===============================
848	dengine |
849	taos> select substring('tdengine', -1, 10)
850	substring('tdengine', -1, 10) |
851	================================
852	e |
853	taos> select substring('中国', 1, 3)
854	substring('中国', 1, 3) |
855	============================
856	中国 |
857	taos> select substring('中国tdengine', 1, 3)
858	substring('中国tdengine', 1, 3) |
859	====================================
860	中国t |
861	taos> select substring(var1, 1, 5) from ts_4893.d0 order by ts limit 10
862	substring(var1, 1, 5) |
863	=================================
864	novel |
865	perso |
866	novel |
867	plate |
868	一二三四五 |
869	updat |
870	prisi |
871	perso |
872	prisi |
873	plate |
874	taos> select substring(var1, 1, 5) from ts_4893.meters order by ts limit 10
875	substring(var1, 1, 5) |
876	=================================
877	novel |
878	perso |
879	novel |
880	plate |
881	一二三四五 |
882	updat |
883	prisi |
884	perso |
885	prisi |
886	plate |
887	taos> select substring(nch1, 1, 5) from ts_4893.d0 order by ts limit 10
888	substring(nch1, 1, 5) |
889	=================================
890	novel |
891	一二三四五 |
892	updat |
893	prisi |
894	novel |
895	novel |
896	again |
897	一二三四五 |
898	novel |
899	again |
900	taos> select substring(nch1, 1, 5) from ts_4893.meters order by ts limit 10
901	substring(nch1, 1, 5) |
902	=================================
903	novel |
904	一二三四五 |
905	updat |
906	prisi |
907	novel |
908	novel |
909	again |
910	一二三四五 |
911	novel |
912	again |
913	taos> select substring(null, 1, 3)
914	substring(null, 1, 3) |
915	========================
916	NULL |
917	taos> select substring('tdengine', null, 3)
918	substring('tdengine', null, 3) |
919	=================================
920	NULL |
921	taos> select substring('tdengine', 0)
922	substring('tdengine', 0) |
923	===========================
924	|
925	taos> select substring('tdengine', 10)
926	substring('tdengine', 10) |
927	============================
928	|
929	taos> select substring('tdengine', 1, null)
930	substring('tdengine', 1, null) |
931	=================================
932	NULL |
933	taos> select substring('tdengine', 1, 0)
934	substring('tdengine', 1, 0) |
935	==============================
936	|
937	taos> select substring('tdengine', 1, -1)
938	substring('tdengine', 1, -1) |
939	===============================
940	|
941	taos> select substr(null, 1, 3)
942	substr(null, 1, 3) |
943	=====================
944	NULL |
945	taos> select substr('Hello', 1, 3)
946	substr('Hello', 1, 3) |
947	========================
948	Hel |
949	taos> select substr('', 1, 5)
950	substr('', 1, 5) |
951	===================
952	|
953	taos> select substr('ABCDE', 0, 3)
954	substr('ABCDE', 0, 3) |
955	========================
956	|
957	taos> select substr('ABCDEFG', -3, 2)
958	substr('ABCDEFG', -3, 2) |
959	===========================
960	EF |
961	taos> select substr('HelloWorld', 2, 5)
962	substr('HelloWorld', 2, 5) |
963	=============================
964	elloW |
965	taos> select substr('1234567890', -5, 5)
966	substr('1234567890', -5, 5) |
967	==============================
968	67890 |
969	taos> select substr('!@#$%^&*()', 2, 4)
970	substr('!@#$%^&*()', 2, 4) |
971	=============================
972	@#$% |
973	taos> select substr('你好世界', 3, 2)
974	substr('你好世界', 3, 2) |
975	===============================
976	世界 |
977	taos> select substr('ABCDEFG', 10, 5)
978	substr('ABCDEFG', 10, 5) |
979	===========================
980	|
981	taos> select substr('ABCDEFG', -1, 3)
982	substr('ABCDEFG', -1, 3) |
983	===========================
984	G |
985	taos> select substr('1234567890', -15, 5)
986	substr('1234567890', -15, 5) |
987	===============================
988	12345 |
989	taos> select substr(concat('Hello', 'World'), 1, 5)
990	substr(concat('Hello', 'World'), 1, 5) |
991	=========================================
992	Hello |
993	taos> select substr('HelloWorld', 1, length('Hello'))
994	substr('HelloWorld', 1, length('Hello')) |
995	===========================================
996	Hello |
997	taos> select substr(upper('helloworld'), 2, 4)
998	substr(upper('helloworld'), 2, 4) |
999	====================================
1000	ELLO |
1001	taos> select substr(trim(' HelloWorld '), 1, 5)
1002	substr(trim(' HelloWorld '), 1, 5) |
1003	=======================================
1004	Hello |
1005	taos> select name, substr(name, 1, 3) from ts_4893.meters limit 1
1006	name | substr(name, 1, 3) |
1007	==================================================================
1008	lili | lil |
1009	taos> select var1, substr(var1, 1, 6) from ts_4893.meters limit 1
1010	var1 | substr(var1, 1, 6) |
1011	==================================================================
1012	novel | novel |
1013	taos> select nch1, substr(nch1, 2, 4) from ts_4893.meters limit 1
1014	nch1 | substr(nch1, 2, 4) |
1015	==================================================================
1016	novel | ovel |