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[TD-4555] <docs>: update example code about SQL function DERIVATIVE().

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Elias Soong 2021-08-20 19:16:47 +08:00
parent d4acd45407
commit d0c6f75f15
1 changed files with 9 additions and 9 deletions
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documentation20/cn/12.taos-sql/docs.md
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@ -1287,15 +1287,15 @@ TDengine支持针对数据的聚合查询。提供支持的聚合和选择函数
示例：
```mysql
taos> select derivative(current, 1d, 0) from t1;
ts | derivative(current, 1d, 0) |
=======================================================
2021-08-20 09:18:44.032 | 119.999966667 |
2021-08-20 10:18:44.032 | -48.000000000 |
2021-08-20 11:18:44.032 | -48.000000000 |
2021-08-20 12:18:44.033 | 215.999940000 |
2021-08-20 13:18:44.034 | -167.999953333 |
Query OK, 5 row(s) in set (0.004772s)
taos> select derivative(current, 10m, 0) from t1;
ts | derivative(current, 10m, 0) |
========================================================
2021-08-20 10:11:22.790 | 0.500000000 |
2021-08-20 11:11:22.791 | 0.166666620 |
2021-08-20 12:11:22.791 | 0.000000000 |
2021-08-20 13:11:22.792 | 0.166666620 |
2021-08-20 14:11:22.792 | -0.666666667 |
Query OK, 5 row(s) in set (0.004883s)
```
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