Index: src/dlg/dlgTable.cpp
===================================================================
--- src/dlg/dlgTable.cpp	(revision 4759)
+++ src/dlg/dlgTable.cpp	(working copy)
@@ -513,8 +513,9 @@
                 definition = definition.Mid(1).BeforeFirst('"');
             else
                 definition = definition.BeforeFirst(' ');
-            sql += wxT("ALTER TABLE ") + tabname
-                +  wxT(" DROP CONSTRAINT ") + qtIdent(definition) + wxT(";\n");
+            sql =  wxT("ALTER TABLE ") + tabname
+                +  wxT(" DROP CONSTRAINT ") + qtIdent(definition) + wxT(";\n")
+                +  sql;
         }
         // Add the ADD CONSTRAINTs...
         sql += tmpsql;