摘要：
EXPLAINselect a.id FROM oa_attachment a LEFT JOIN sys_user u ON u.id = a.create_by LEFT JOIN sys_user v ON v.id = a.writer where a.del_flag=0 优化统一u.id 阅读全文
|
摘要：
EXPLAINselect a.id FROM oa_attachment a LEFT JOIN sys_user u ON u.id = a.create_by LEFT JOIN sys_user v ON v.id = a.writer where a.del_flag=0 优化统一u.id 阅读全文
|