How in php/mySQL can i make a column equal another column?
id is auto increment, xid should be unique. Can i make xid = id in SQL? (the reason for this is to log changes but i'll explain more if needed)
To make xid unique the best way is to copy the auto increment of id
+----+-----+----------+----------------+------+---------+
| id | xid | title | body | page | visible |
+----+-----+----------+----------------+------+---------+
| 1 | 1 | my title | my body | NULL | 1 |
| 2 | 2 | my title | my body edited | 1 | 0 |
+----+-----+----------+----------------+------+---------+
$queryX = "INSERT INTO table (xid, title, body, page, visible)
VALUES (, 'Plays', 'it's playing', 'book page', 1)";
I don't understand why you want to do this, but my approach would be using two queries and LAST_INSERT_ID()
:
INSERT INTO table (title, body, page, visible)
VALUES ('Plays', 'it''s playing', 'book page', 1);
UPDATE table SET xid = id WHERE id = LAST_INSERT_ID();
You may want to do this using a TRIGGER
, so you don't have to do it manually.
In one query:
INSERT INTO table (xid, title, body, page, visible) VALUES ( SELECT MAX(xid) + 1, .... )
it will put unique xid, can be done with id also, I not quite sure I undestand the need...
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