两种查询可以用于update语句的where子句中：标量子查询和表子查询。
Two types of queries can be used in the WHERE clause of an UPDATE statement: a scalar subquery and a table subquery.
两种查询可以用于update语句的where子句中：标量子查询和表子查询。
Two types of queries can be used in the WHERE clause of an UPDATE statement: a scalar subquery and a table subquery.
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