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How can I combine 2 columns in sql table to search for full names

I have a mySQL database with a FirstName and LastName column and presently i have a search query searching for Lastnames, and When the LastNames match they are echoed on screen along with the FirstName from it's row, Now thats great, what i will like to find out is how can a make the query search for FullNames that are typed into the input feild, keep in mind that i do not have a FullName column the full name will be what the user types in, bellow is an example of what I presently have working! Thanks.

if(isset($_GET['name'])){   
    $raw_name=$_GET['name'];

    if(preg_match("/[A-Z | a-z]+/", $raw_name)){        
        $name=$raw_name;        
        include "connect.php";      
        //-query the database table
        $sql="SELECT userId, FirstName, LastName FROM residential2 WHERE FirstName='" . $name   ."'";
        //-run the query against the mysql query function
        $result=mysql_query($sql);
        //-count results
        $numrows=mysql_num_rows($result);

        echo "<div align=\"center\">" . $numrows . " results found for " . stripslashes($name) . "</div>";

        while($row=mysql_fetch_array($result)){         
            $FirstName =$row['FirstName'];
            $LastName=$row['LastName'];
            $userId=$row['userId']; 
            //-display the result of the array
            echo "<ul>\n"; 
            echo "<li>" . "<a href=\"index.php?id=$userId\">" . $LastName . " "  .$FirstName . "   </a></li>\n";
            echo "</ul>";
        }
    }
    else {      
        echo "<p>Please enter a search query</p>";
    }
}

Use concat()

$sql="SELECT userId, CONCAT(FirstName, ' ', LastName) AS fullname FROM residential2 WHERE FirstName='" . $name   ."'";

<?php
    $fullname = $row['fullname']; 
?> 

You can do this:

$sql="SELECT userId, FirstName, LastName 
            FROM residential2 
            WHERE concat(FirstName, ' ', LastName) like '%$name%'";

its very very simple !!

SELECT * FROM your_table WHERE CONCAT( field1, ' ' , filed2 ) like '% $query %'

You will have to split the full name into first name and last name and then search accordingly. A code snippet for you:

SELECT REVERSE(SUBSTR(REVERSE(name),INSTR(REVERSE(name),' ')+1)) AS first_name,
REVERSE(SUBSTR(REVERSE(name),1,INSTR(REVERSE(name),' '))) AS last_name

Hope it helps.

$frnd_name = trim(preg_replace( "/[ ]+/", " ", $_GET['frnd_search'] ) );
$arr = explode(" ", $frnd_name, 2);

if(!empty($arr[1]))
    $sql_where = "name LIKE '%".$arr[0]."%' AND lastname LIKE '%".$arr[1]."%'";
else
    $sql_where = "name LIKE '%".$arr[0]."%' OR lastname LIKE '%".$arr[0]."%' OR username LIKE '%".$arr[0]."%' OR email LIKE '%".$arr[0]."%'";

$sql = "SELECT name,lastname,username,email FROM user WHERE ".$sql_where;
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "".$row['name']." ".$row['lastname']."<br>";
    }
}
SELECT lname, fname FROM TABLE where CONCAT(fname, ' ', lname) LIKE '%$fullname%'

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