I've looked for similar questions with no success.
I have this piece of code:
$query = "INSERT INTO table1 "; $query .= "(fname, lname, mail)"; $query .= " VALUES "; $query .= "('".$_POST[fname]."', '".$_POST[lname]."', '".$_POST[mail]."')"; $result = mysql_query($query) or die ("Query Failed: " . mysql_error());
And I want that the script will check if the value inserted exists in the corresponding column, and throw an error if it does. any ideas?
Create a UNIQUE key on the fields you care about, and detect the integrity error after the fact.