我有两列,一列是member_id,另一列是connection_member_id。我必须检查是否已在数据库中插入member和connection_member,然后不要将其插入。
试图获取这样的东西
SELECT * FROM `mlm_connections` mc
LEFT JOIN temp_connections_members tcm
ON tcm.member_id != mc.member_id
AND tcm.connection_member_id != mc.connection_member_id;
最佳答案
尝试这个
SELECT * FROM `mlm_connections` mc
WHERE mc.member_id NOT Exists (SELECT member_id FROM temp_connections_members) AND
mc.connection_member_id NOT Exists (SELECT connection_member_id FROM temp_connections_members)
关于mysql - MySQL查询问题,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/23868218/