From d16f6cec44b72b7898d8c7f56efa6679e0408d88 Mon Sep 17 00:00:00 2001 From: Alex Arnaud Date: Thu, 7 Apr 2011 16:55:08 +0200 Subject: [PATCH] Bug #6123 - Optimization of the SQL request using NOT EXISTS instead of NOT IN --- reports/borrowers_out.pl | 19 ++++++------------- 1 files changed, 6 insertions(+), 13 deletions(-) diff --git a/reports/borrowers_out.pl b/reports/borrowers_out.pl index 0a135e1..ed0fc0b 100755 --- a/reports/borrowers_out.pl +++ b/reports/borrowers_out.pl @@ -229,19 +229,12 @@ sub calculate { $strcalc .= "WHERE 1 "; @$filters[0]=~ s/\*/%/g if (@$filters[0]); $strcalc .= " AND borrowers.categorycode like '" . @$filters[0] ."'" if ( @$filters[0] ); - - my $strqueryfilter = "SELECT DISTINCT borrowernumber FROM "; - $strqueryfilter .= "(SELECT borrowernumber from old_issues WHERE borrowernumber IS NOT NULL "; - if ($filters->[1]){ - $strqueryfilter .= "AND old_issues.timestamp> '$filters->[1]' "; - } - $strqueryfilter .= "UNION SELECT borrowernumber FROM issues WHERE 1 "; - if ($filters->[1]){ - $strqueryfilter .= "AND issues.timestamp> '$filters->[1]' "; - } - $strqueryfilter .= ") active_borrowers"; - - $strcalc .= " AND borrowers.borrowernumber not in ($strqueryfilter)"; + $strcalc .= " AND NOT EXISTS (SELECT * FROM issues WHERE issues.borrowernumber=borrowers.borrowernumber "; + $strcalc .= " AND issues.timestamp> '" . @$filters[1] . "'" if (@$filters[1]); + $strcalc .= ") "; + $strcalc .= " AND NOT EXISTS (SELECT * FROM old_issues WHERE old_issues.borrowernumber=borrowers.borrowernumber "; + $strcalc .= " AND old_issues.timestamp> '" . @$filters[1] . "'" if (@$filters[1]); + $strcalc .= ") "; $strcalc .= " group by borrowers.borrowernumber"; $strcalc .= ", $colfield" if ($column); $strcalc .= " order by $colfield " if ($colfield); -- 1.6.3.3