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my $quer = "SELECT checklist.id FROM group_management,User_group_manag
+ement_mapping,profiles,checklist,checklist_group_mapping WHERE User_g
+roup_management_mapping.userid = $usr and  profiles.userid = User_gro
+up_management_mapping.userid and group_management.id =User_group_mana
+gement_mapping.groupid and checklist_group_mapping.checklist_id = che
+cklist.id and checklist_group_mapping.group_id = group_management.id"
+;
my $query = $dbh -> prepare($quer);
$query-> execute();

my $SQLquery = "
    SELECT checklist.id 
...

my $sth = $dbh->prepare( $SQLquery );
$sth->execute( $usr );