Fix UNION Dbo test for Firebird, disable EXCEPT/INTERSECT for MySQL/FB

Author: RockinRoel

test/dbo/DboTest.C

@@ -3092,7 +3092,7 @@ BOOST_AUTO_TEST_CASE( dbo_test39a )
   {
     dbo::Transaction t(*session_);
 
-    As as = session_->query<Wt::Dbo::ptr<A> >("select a from table_a a where i = 3 union select a from table_a a where i = 5");
+    As as = session_->query<Wt::Dbo::ptr<A> >("select a from \"table_a\" a where a.\"i\" = 3 union select a from \"table_a\" a where a.\"i\" = 5");
 
     BOOST_REQUIRE(as.size() == 2);
 
@@ -3107,6 +3107,7 @@ BOOST_AUTO_TEST_CASE( dbo_test39a )
 
 BOOST_AUTO_TEST_CASE( dbo_test39b )
 {
+#if !defined(MYSQL) && !defined(FIREBIRD) // MySQL and Firebird don't do INTERSECT
   // Test INTERSECT
   DboFixture f;
   dbo::Session *session_ = f.session_;
@@ -3116,7 +3117,7 @@ BOOST_AUTO_TEST_CASE( dbo_test39b )
   {
     dbo::Transaction t(*session_);
 
-    As as = session_->query<Wt::Dbo::ptr<A> >("select a from table_a a where i > 3 intersect select a from table_a a where i < 5");
+    As as = session_->query<Wt::Dbo::ptr<A> >("select a from \"table_a\" a where a.\"i\" > 3 intersect select a from \"table_a\" a where a.\"i\" < 5");
 
     BOOST_REQUIRE(as.size() == 1);
 
@@ -3125,10 +3126,12 @@ BOOST_AUTO_TEST_CASE( dbo_test39b )
     ++it;
     BOOST_REQUIRE(it == as.end());
   }
+#endif
 }
 
 BOOST_AUTO_TEST_CASE( dbo_test39c )
 {
+#if !defined(MYSQL) && !defined(FIREBIRD) // MySQL and Firebird don't do EXCEPT
   // Test EXCEPT
   DboFixture f;
   dbo::Session *session_ = f.session_;
@@ -3138,7 +3141,7 @@ BOOST_AUTO_TEST_CASE( dbo_test39c )
   {
     dbo::Transaction t(*session_);
 
-    As as = session_->query<Wt::Dbo::ptr<A> >("select a from table_a a where i >= 3 except select a from table_a a where i = 4");
+    As as = session_->query<Wt::Dbo::ptr<A> >("select a from \"table_a\" a where a.\"i\" >= 3 except select a from \"table_a\" a where a.\"i\" = 4");
 
     BOOST_REQUIRE(as.size() == 2);
 
@@ -3149,4 +3152,5 @@ BOOST_AUTO_TEST_CASE( dbo_test39c )
     ++it;
     BOOST_REQUIRE(it == as.end());
   }
+#endif
 }