Question

I have this SQL statement which I could not get to work, and I’m not sure what I’m doing wrong.

This is the SQL :

INSERT INTO data
(id_user,id_inf)
VALUES
(
 (SELECT userid FROM t4_adsmanager_ads WHERE userid NOT IN (select id_user from data) ),
 (SELECT id     FROM t4_adsmanager_ads WHERE id     NOT IN (select id_inf from data))
)

as what I wanted to do is in t4_adsmanager_ads I have ads created by users

Let’s say user in t4_adsmanager_ads with id = 47 have ads with id= 1,2,3

in data table I have

     id   id_inf   id_user

and i want it to be like that

         id   id_inf   id_user
         50     1        47
         51     2        47
         52     3        47

edit :
my errors is no error just did not work
thx

Answer 1

Your current syntax requires that the subselects return exactly one record, which is not the case in your example.

I suggest you create a UNIQUE index in the data table over the composite columns (id_user, id_inf):

ALTER TABLE data ADD UNIQUE INDEX (id_user, id_inf);

And then you merely need use INSERT ... SELECT with the IGNORE modifier:

INSERT IGNORE INTO data (id_user, id_inf) SELECT userid, id FROM t4_adsmanager_ads;