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Update 06-select.md

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docs/en/12-taos-sql/06-select.md
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@ -227,7 +227,7 @@ select _irowts, interp(current) from meters range('2020-01-01 10:00:00', '2020-0
### TAGS Query
The TAGS keyword returns only tag columns from the child tables when only tag columns are specified. One row containing tag columns is returned for each child table.
The TAGS keyword returns only tag columns from all child tables when only tag columns are specified. One row containing tag columns is returned for each child table.
```sql
SELECT TAGS tag_name [, tag_name ...] FROM stb_name