MySQL检查行是否存在并在同一查询中将其删除

Question

I would like to do the following in one query, I was wandering if it is even possible:

$rowsQ = $mysql->query("SELECT * FROM `table` WHERE (a='a' AND b='b')");
if($rowsQ->num_rows){
    $mysql->query("DELETE FROM `table` WHERE (a='a' AND b='b')");
}

I have seen a similar thing with WHERE EXISTS but only with a query for a different table like so:

$mysql->query("DELETE FROM `table` WHERE EXISTS (SELECT * FROM `table2` WHERE table.id = table2.id)");

Is it possible to do on the same table though and if so do I have to rewrite the same conditions or is there a shorter way?

Answer 1

you can simply use DELETE , in case row doesn't exists with the specified values, the query would return with out doing any thing. you can avoid the select

DELETE FROM table WHERE a ='a' and b='b'