How to use multiple queries based on users selection

I have a highcharts chart im using to display number of downloads on apps. The chart is being populated by mysql query.

I have 2 bootstrap dropdown-menu's for that chart. one is date range, and the other is app. The app is populated by a sql query.

Each one of these dropdown's work fine independently. i want them to work together. So if the user chooses a app then a date it will keep track of both.

Here is how im handling the $GET's now

if (isset($_GET['id'])) {
    $app = $_GET['id'];
    $array2 = explode('/', $app);
    $activity = $array2[0];
    $app_name = $array2[1];
    $SQL= " SELECT blah blah blah WHERE activity = ' $activity' ";
} else if (isset($_GET['date'])) {
      $daterange = $_GET['date'];
              if ($daterange = "thisyear"){
               $SQL =
               }
              if ($daterange = "lastyear"){
               $SQL =
               }
} else {
    $SQL = 
}

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I can provide more info if needed.
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bignadadAsked:
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Tom BeckCommented:
$SQL = "SELECT blah blah blah WHERE ";
if (isset($_GET['id'])) {
    $app = $_GET['id'];
    $array2 = explode('/', $app);
    $activity = $array2[0];
    $app_name = $array2[1];
    $SQL .= "activity = ' $activity' ";
}
if (isset($_GET['date'])) {
	$daterange = $_GET['date'];
	if ($daterange = "thisyear"){
	 $SQL .= "AND date = 'thisyear'"; //whatever date value needs to be for this year
	 }
	if ($daterange = "lastyear"){
	 $SQL .= "AND date = 'lastyear'"; //whatever date value needs to be for last year
	 }
} 

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bignadadAuthor Commented:
okay. I understand this and will work well.

However, you put the WHERE on the first line of $SQL. when table initially loads it won't have a where clause.

Also you put AND if $_GET date exists. What if there is only app chosen and no date? or date and no app?
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