--- loncom/interface/loncoursedata.pm	2004/04/30 14:36:52	1.132
+++ loncom/interface/loncoursedata.pm	2004/06/04 17:46:10	1.134
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: loncoursedata.pm,v 1.132 2004/04/30 14:36:52 matthew Exp $
+# $Id: loncoursedata.pm,v 1.134 2004/06/04 17:46:10 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -547,12 +547,14 @@ store student data.
 ################################################
 ################################################
 sub init_dbs {
-    my $courseid = shift;
+    my ($courseid,$drop) = @_;
     &setup_table_names($courseid);
     #
     # Drop any of the existing tables
-    foreach my $table (@Tables) {
-        &Apache::lonmysql::drop_table($table);
+    if ($drop) {
+        foreach my $table (@Tables) {
+            &Apache::lonmysql::drop_table($table);
+        }
     }
     #
     # Note - changes to this table must be reflected in the code that 
@@ -1081,6 +1083,7 @@ sub populate_student_table {
     }
     #
     &setup_table_names($courseid);
+    &init_dbs($courseid,0);
     my $dbh = &Apache::lonmysql::get_dbh();
     my $request = 'INSERT IGNORE INTO '.$student_table.
         "(student,section,status) VALUES ";
@@ -1594,7 +1597,7 @@ sub ensure_tables_are_set_up {
         !$found_performance   || !$found_parameters        ||
         !$found_fulldump_part || !$found_fulldump_response ||
         !$found_fulldump_timestamp || !$found_weight ) {
-        if (&init_dbs($courseid)) {
+        if (&init_dbs($courseid,1)) {
             return 'error';
         }
     }
@@ -2030,12 +2033,14 @@ sub get_problem_statistics {
     }
     my ($solved) = &execute_SQL_request($dbh,$request);
     #
+    $Solved -= $solved;
+    #
     $num    = 0 if (! defined($num));
     $tries  = 0 if (! defined($tries));
     $max    = 0 if (! defined($max));
     $min    = 0 if (! defined($min));
     $STD    = 0 if (! defined($STD));
-    $Solved = 0 if (! defined($Solved));
+    $Solved = 0 if (! defined($Solved) || $Solved < 0);
     $solved = 0 if (! defined($solved));
     #
     # Compute the more complicated statistics