Update 06-select.md

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@ -162,7 +162,7 @@ SELECT DISTINCT col_name [, col_name ...] FROM tb_name;
### 标签查询
当查询的列只有标签列时,`TAGS` 关键字可以指定返回所有子表的标签列。每个子表只返回一行标签列。
当查询的列只有标签列时,`TAGS` 关键字可以指定返回所有子表的标签列。每个子表只返回一行标签列。
返回所有子表的标签列: