order by fixes

select.go

@@ -101,17 +101,17 @@ func (s *selectBuilder) Build() (string, error) {
 
 	// add group by
 	if s.groupBy != "" {
-		b.WriteString(s.groupBy + " ")
+		b.WriteString(" GROUP BY " + s.groupBy + " ")
 	}
 
 	// add partition by
 	if s.partitionBy != "" {
-		b.WriteString(s.partitionBy + " ")
+		b.WriteString(" PARTITION BY " + s.partitionBy + " ")
 	}
 
 	// add order by
 	if s.orderBy != "" {
-		b.WriteString(s.orderBy + " ")
+		b.WriteString(" ORDER BY " + s.orderBy + " ")
 	}
 
 	// add limit

tsdbbuilder_test.go

@@ -83,13 +83,19 @@ func Test_Delete(t *testing.T) {
 }
 
 func Test_Select(t *testing.T) {
+	limit := uint64(10)
+	offset := uint64(0)
+
 	b := tsbuilder.NewSelectBuilder().
 		Columns("col_1", "col_2", "col_3").
 		From("dbName.test_table").
 		Where(
 			"asasd > asd",
 			"asdfasdf <= 1212",
-		)
+		).
+		OrderBy("ts desc").
+		Limit(&limit).
+		Offset(&offset)
 
 	sql, err := b.Build()
 	if err != nil {