single-row subquery returns more than one row

错误描述：single-row subquery returns more than one row

原因：子查询可能查到两个或以上的相同数据

解决方案：加一个distinct，效果：去重
（仅自己开发时遇到的问题，记录）

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single-row subquery returns more than one row

错误描述：single-row subquery returns more than one row

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