SELECT FROM one table and INSERT INTO another; using WHERE & AND

Question

INSERT INTO tblPubInfo i (img_name)
SELECT f.img_name
FROM tblPubFiles f 
WHERE f.img_name<>''
AND f.pub_uid = i.uid

this is what I am trying to do but it is giving me a error. What is wrong with it and how to fix it?

Answer 1

Your are referencing the target table in Your condition (i.uid). This is not allowed, because it does not appear in the tables (from clause).

Answer 2

It's a bit hard to help you without supplying the error.

However, if your database is MySQL,

MySQL doesn't support ALIAS on INSERTS

INSERT INTO tblPubInfo i (img_name)

should be:

INSERT INTO tblPubInfo (img_name)

see here:

http://dev.mysql.com/doc/refman/5.1/en/insert.html

Answer 3

Shouldn't that be:

INSERT INTO tblPubInfo (img_name)
SELECT f.img_name
FROM tblPubFiles f, tblPubInfo i
WHERE f.img_name<>''
AND f.pub_uid = i.uid

Answer 4

Seems like you are trying to update a recored with an insert into statement. That doesn't work. Use the following:

UPDATE tblPubInfo i
SET i.img_name = ( SELECT f.img_name 
                   FROM   tblPubFiles f 
                   WHERE  f.img_name is not null 
                   AND    f.pub_uid = i.uid
                 )

Answer 5

You need to join the two tables in the Select clause, in order to use the alias i for the table tblPubInfo like:

INSERT INTO tblPubInfo (img_name) 
SELECT f.img_name
FROM tblPubFiles f 
inner join tblPubInfo i on f.pub_uid = i.uid
WHERE f.img_name <> ''

Answer 6

try this:

INSERT INTO tblPubInfo (img_name) 
SELECT a.img_name
FROM   tblPubFiles a INNER JOIN tblPubInfo b ON a.pub_uid = b.uid
WHERE  CHAR_LENGTH(TRIM(a.img_name)) > 0