尝试此 :
SELECT u.name, m.message_id
FROM users u, messages m
WHERE (m.user1 = u.user_id AND m.user2 = "001")
OR (m.user2 = u.user_id AND m.user1 = 001)
Select u.name, m1.message_id from users u
inner join messages m1
On m1.user1 = u.user_id
Inner join Messages m2
On m2.user2=u.user_id
Where m1.user1= 001 or m2.user2= 001
我希望这能帮到你
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