从php / mysql中的两个表中删除一条记录

Question

I'm trying to delete a "boat" from boat table and associated qualifications in another table using the following code:

DELETE FROM tbl_boat, tbl_qualifications 
WHERE tbl_boat.BT_ID = '$bt_id' AND tbl_boat.BT_ID = tbl_qualifications.BT_ID;

The problem is I'm receiving following error:

1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'WHERE tbl_boat.BT_ID = 113 AND tbl_boat.BT_ID = tbl_ ' at line 2 .

Appreciate any help on this.

Answer 1

You may want to try INNER JOIN.

DELETE FROM tbl_boat
INNER JOIN tbl_qualifications
WHERE tbl_boat.BT_ID = '$bt_id' AND tbl_boat.BT_ID = tbl_qualifications.BT_ID;

I haven't tested this, but I think this will work.

Answer 2

You have to tell MySQL how the two tables are related:

DELETE tbl_boat, tbl_qualifications
FROM
    tbl_boat
    INNER JOIN tbl_qualifications USING (BT_ID)
WHERE
    tbl_boat.BT_ID = '$bt_id'

Answer 3

You need to perform two delete :

-- DELETE all associations first ...
DELETE FROM tbl_qualifications WHERE BT_ID = '$bt_id';

-- ... then delete the boat
DELETE FROM tbl_boat WHERE BT_ID = '$bt_id';

Answer 4

it should be

DELETE tbl_boat, tbl_qualifications FROM tbl_boat, tbl_qualifications 
WHERE tbl_boat.BT_ID = '$bt_id' AND tbl_boat.BT_ID = tbl_qualifications.BT_ID;

btw take a look at How to delete from multiple tables in MySQL?

Answer 5

This will definitely work:

DELETE a.*, b.*
FROM tbl_boat AS a
INNER JOIN tbl_qualifications AS b
    ON b.BT_ID = a.BT_ID
WHERE tbl_boat.BT_ID = '$bt_id';

Also, if the BT_ID is INTEGER type, then remove the quotation from around $bt_id .

Answer 6

Try This

DELETE uploadfeat,postfeeds,postcomment FROM uploadfeat INNER JOIN postfeeds INNER JOIN postcomment
WHERE uploadfeat.id=postfeeds.postID AND uploadfeat.id=postcomment.postID AND uploadfeat.id=23