消息:ID名称’%s’过长。 · 错误:1060 SQLSTATE: 42S21 (ER_DUP_FIELDNAME) 消息:重复列名’%s’。 · 错误:1061 SQLSTATE: 42000 (ER_DUP_KEYNAME) 消息:重复键名称’%s’。 · 错误:1062 SQLSTATE: 23000 (ER_DUP_ENTRY) 消息:键%d的重复条目’%s’。 · 错误:1063 SQLSTATE: 42000 (ER_WRONG...
As depicted in the screenshot of executing both queries, choosing the incorrect probe side for this query already results in a performance difference of an order of magnitude. For more complex queries, the variations in execution time could be not only larger but also more difficult to trace. ...