is it possible to put in if statement in mysql query?

[cyberock]

I'd like to do a check for some defined variables inside my query. I was hoping to do something like this but this of course doesn't work...

query = "SELECT * ".
"FROM table".
"where id = 1 "
if(isset($GET[variable1])){
."and variable1 = $GET[variable1] "}
if(isset($GET[variable2])){
."and variable2 = $GET[variable2] "};

Any suggestions how I could get something like this to work? Thanks!

[LordShryku]

$sql = "SELECT *
        FROM   table
        WHERE  id = 1 ";

if(isset($_GET['variable1'])) { 
   $sql .= "AND variable1 = '".$_GET['variable1']."'";
} 
if(isset($_GET['variable2'])) { 
   $sql .= "AND variable2 = '".$_GET['variable2']."'";
} 

[cyberock]

Thanks for helping out a newbie! That worked perfect!