The subquery must be enclosed in parentheses.

子查询必须用括号括起来。

Use a subquery to filter the main query results.

使用子查询来过滤主查询结果。

You can optimize your SQL statement by using a subquery.

你可以通过使用子查询来优化你的SQL（Structured Query Language，结构化查询语言）语句。

The subquery returns a list of IDs that are used in the main query.

子查询返回一个在主查询中使用的ID列表。

A subquery can be used in the WHERE clause to narrow down the results.

子查询可以在WHERE子句中使用以缩小结果范围。

Mapping subquery and aggregate functions

映射子查询和聚合功能

There are not enough columns in the subquery select list.

子查询选择列表中没有足够的列。

Missing subquery or the operator you entered requires parenthesis.

缺少子查询或输入的运算符需要圆括号.

When this statement is executed, the subquery is evaluated first.

当这条语句执行的时候,子查询会先执行.

Often a subquery can substitute a temporary table.

通常一个子查询可以代替一个临时表.