xxq250
/
homework-jianmu
1
0
Fork 0
Code Issues Pull Requests 1 Actions Packages Projects Releases Wiki Activity

doc: refine a few points in 06-select.md

This commit is contained in:
gccgdb1234 2022-09-20 09:39:55 +08:00
parent 004e9dabd2
commit 82684bb417
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
docs/en/12-taos-sql/06-select.md
View File

@ -66,7 +66,7 @@ order_expr:
A query can be performed on some or all columns. Data and tag columns can all be included in the SELECT list. A query can be performed on some or all columns. Data and tag columns can all be included in the SELECT list.
## Wildcards ### Wildcards
You can use an asterisk (\*) as a wildcard character to indicate all columns. For standard tables, the asterisk indicates only data columns. For supertables and subtables, tag columns are also included. You can use an asterisk (\*) as a wildcard character to indicate all columns. For standard tables, the asterisk indicates only data columns. For supertables and subtables, tag columns are also included.
@ -136,6 +136,8 @@ taos> SELECT ts, ts AS primary_key_ts FROM d1001;
### Pseudocolumns ### Pseudocolumns
**Pseudocolumn:** A pseudo-column behaves like a table column but is not actually stored in the table. You can select from pseudo-columns, but you cannot insert, update, or delete their values. A pseudo-column is also similar to a function without arguments. This section describes these pseudo-columns:
**TBNAME** **TBNAME**
The TBNAME pseudocolumn in a supertable contains the names of subtables within the supertable. The TBNAME pseudocolumn in a supertable contains the names of subtables within the supertable.