mysql 1242 subquery returns more than 1 row

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来自子查询的行的数目不正确： ERROR 1242 (ER_SUBSELECT_NO_1_ROW) SQLSTATE = 21000 Message = "Subquery returns more than 1 row" 如果在语句中，子查询返回的行多于一个，则发生此错误。请考虑以下例子： SELECT * FROM t1 WHERE column1 = (SELECT column1 FROM t2); 如果SELECT column1 FROM t2只返回一行，则将执行以前的查询。如果子查询返回的行多于一个，则将出现错误1242。在这种情况下，该查询将被改写为： SELECT * FROM t1 WHERE column1 = ANY (SELECT column1 FROM t2); SELECT XXX FROM 表1 WHERE XX = X AND XXX = ANY (SELECT XXX FROM 表2);

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