Question

How can I uniquely identify two or more columns, that I have used table named address in the database, now address is has fields like street name, suite name and street num.

strnum | strnam | sutname

---

1 | xyz | 32

1 | xyz | 32

now how can I uniquely these three columns. That is I want to check whether these three column are already inserted or not. If any field valus is changed than its ok, it will insert new one. but in case all three similar field..Help me to combinely identify these three fields.

Answer 1

$query = "SELECT * FROM `address` WHERE `strnum` = '$strnum' AND `strnam` = '$strnam' AND `sutname` = '$sutname' LIMIT 1";
$result = mysql_query($query);
if (!mysql_num_rows($result)) {
    // If you get to here, there is no existing record
    $query = "INSERT INTO `address` (`strnum`,`strnam`,`sutname`) VALUES ('$strnum','$strnam','$sutname')";
    if (!mysql_query($query)) print('Insert failed!');
} else print('Record already exists!');

EDIT I just added a missing ; so this parses…