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

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gccgdb1234 2022-09-20 09:39:55 +08:00
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docs/en/12-taos-sql/06-select.md
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@ -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.
## 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.
@ -136,6 +136,8 @@ taos> SELECT ts, ts AS primary_key_ts FROM d1001;
### 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**
The TBNAME pseudocolumn in a supertable contains the names of subtables within the supertable.