MYSQL ERROR

(个人草稿）

Error Code: 1093.

Error Code: 1093. You can't specify target table 'mtopics' for update in FROM clause
解决方法：
https://blog.csdn.net/qq_29672495/article/details/72668008

Error Code: 1452.

Error Code: 1452. Cannot add or update a child row: a foreign key constraint fails (mutopic.mtopics, CONSTRAINTmtopics_ibfk_1FOREIGN KEY (main_topic_id) REFERENCESmtopics(topic_id))

Error Code: 1366.

Error Code: 1366. Incorrect string value: '\xEFens' for column 'topic_name' at row 95

多重查询效率低

MYSQL ERROR

Error Code: 1205.

Error Code: 1205.Lock wait timeout exceeded; try restarting transaction
解决方法：
https://blog.csdn.net/zhaofuqiangmycomm/article/details/82150815

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