sql delete result from query

问题

I have two tables, same structure

• clients contains row 1+2
• clients3 only row 2

I want to delete row 2 in the clients table

 SELECT * 
 FROM clients 
 WHERE EXISTS (SELECT * FROM clients3 WHERE clients3.id = clients.id))

gives me the row 2. But I do not know how to delete.

DELETE * 
FROM clients 
WHERE (SELECT * 
       FROM clients 
       WHERE EXISTS (SELECT * FROM clients3 WHERE clients3.id = clients.id))

does not work.

回答1:

You need to create temporary table for the subquery,

DELETE 
FROM clients 
WHERE ID IN 
(
    SELECT ID
    FROM
    (
        SELECT ID FROM clients WHERE EXISTS (SELECT * FROM clients3 WHERE clients3.id = clients.id)
    ) x
)

回答2:

No need to refer clients table twice in your query and remove * from DELETE clause -

DELETE c1
FROM clients c1
INNER JOIN clients3 c3 ON c3.id = c1.id --INNER JOIN will work as EXISTS for 1-1 Relation

回答3:

Try this

   Delete from clients where id  in(select clients3.id from clients3)

来源：https://stackoverflow.com/questions/12997586/sql-delete-result-from-query