Question

I have two tables properties and buildings. I want to extract rows from the buildings table according to a criteria.

I have put these buildings ids in a variable, as below:

$buildings = "1,2,3,4,5,6,7,8,9,10"

I am trying to access the properties according to the above list.

SELECT * FROM properties WHERE BUILDING_ID IN ('{$buildings}')

but I am not getting the desired result. How can I get the desired result? Is this the right approach?

Answer 1

You could do something like:

$buildings = "1,2,3,4,5,6,7,8,9,10";
$buildingIDs = explode(",", $buildings);

$buildingQueries = array();
foreach ($buildingIDs as $buildingID) {
  $buildingQueries[] = "BUILDING_ID = " . $buildingID;
}

$query = "SELECT * FROM properties WHERE " . implode(" OR ", $buildingQueries);

That will let you take advantage of indexes, and allow for variable IDs.

Warning: you should look into mysqli or PDO, and move away from the soon to be deprecated mysql library