MariaDB 10.3 解決掉了UPDATE不支持同一張表的子查詢更新。
下面直接看案例
CREATE TABLE t1 (c1 INT, c2 INT); INSERT INTO t1 VALUES (10,10), (20,20); UPDATE t1 SET c1=c1+1 WHERE c2=(SELECT MAX(c2) FROM t1);
MySQL5.7 直接報錯
MySQL 8.0 直接報錯
MariaDB 10.3 更新成功
MySQL目前只能改寫SQL實現，即max那條語句讓其產生衍生表就可以通過。
UPDATE t1 a, (SELECT MAX(c2) as m_c2 FROM t1) as b SET a.c1=a.c1+1 WHERE a.c2=b.m_c2;
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同理看下DELETE刪除操作。
DROP TABLE t1; CREATE TABLE t1 (c1 INT, c2 INT); DELETE FROM t1 WHERE c1 IN (SELECT b.c1 FROM t1 b WHERE b.c2=0);
MySQL 8.0 直接報錯
MariaDB 10.3 刪除成功
參考：https://jira.mariadb.org/browse/MDEV-12137