MySQL-删除一行，如何？

Question

Can anyone show me a query in MySQL that would delete rows from all available columns.

I use this to insert rows:

$sql = "INSERT INTO " . KEYS . "          // KEYS is a constant
 (key, user_id, time, approved)
 VALUES ('" .  $randkey . "', '" . $user_id . "', '" .  $time . "', '0')";

I need the opposite of this now, delete created rows.

Answer 1

delete from <table> where ....

请记住，delete语句始终用于整行。

Answer 2

Using similar syntax sql = "DELETE FROM " . KEYS . " WHERE 1=1";

Replace 1=1 with the conditions for the row you want to delete or it will delete all rows.

Also, it's good to get out of the habit of just dropping variables into SQL as soon as possible, because it will open your code up to SQL Injection attacks. Look into using parameterized queries.