In your statement, this is not needed, but I added this to just "show how its done". When you prepare the statement, you can put in a ? to mean that parameter will be supplied when you call execute.

A complicated statement will take a while to prepare as the data base will figure out its strategy for executing it. You can keep "reusing" a prepared query with different values. This way of doing it is also better than interpolating a different Perl variable into the statement for security reasons. 

To make a parameter a variable, use a placeholder:
my $query = $dbh->prepare("SELECT c2.id, c2.name as 'client' 
                          FROM client c2 
                          WHERE level = ? and status = ?");

my $level = 50;
$query->execute($level,1);
$level = 60;
$query->execute($level,1);

[download]
Update: you may find this feature useful in dealing with other of your queries. A common technique to run essentially the same query multiple times with different values is to create a data structure, an array, a hash table, etc and then make a loop to cycle through that structure, executing the query again and again. with different values. This can reduce the clutter of repeating the same SQL again and again.

In reply to Re^5: Help with MySQL SELECT into multidimensional array by Marshall
in thread Help with MySQL SELECT into multidimensional array by btongeorge

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