GAUSS-02353：more than one row returned by a subquery used as an expression SQLSTATE: 21000

错误码

错误描述：more than one row returned by a subquery used as an expression SQLSTATE: 21000

错误原因：子查询返回了多余一行的数据。

解决方法：检查子查询语句的条件，保证只返回一条数据。

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