add update statement

insert_test.go

@@ -29,6 +29,10 @@ func TestInsert(t *testing.T) {
 			Args:   []any{1234, "Adam"},
 			String: "insert or update into customer (id, name) values (?, ?)",
 		},
+		{
+			In:     Insert("customer").Columns("name").Select(Select("baby_names").Columns("name")),
+			String: "insert into customer (name) select name from baby_names",
+		},
 	}
 
 	for _, testCase := range testCases {