Add SubQuery to InserBuilder

insert.go

@@ -39,6 +39,16 @@ func (q *InsertBuilder) Values(values ...interface{}) *InsertBuilder {
 	return q
 }
 
+// SubQuery add values from a subquery to the insert query.
+func (q *InsertBuilder) SubQuery(v SelectQuery) *InsertBuilder {
+	if len(v.Fields()) != len(q.fields) {
+		panic(`Number of values has to match the number of fields`)
+	}
+
+	q.values = append(q.values, []Field{MakeField(v)})
+	return q
+}
+
 // Upsert turns the INSERT query into an upsert query, only usable if your driver supports it
 func (q *InsertBuilder) Upsert(query Query, conflict ...Field) *InsertBuilder {
 	if q.ignoreConflict {

internal/tests/tests_test.go

@@ -67,10 +67,12 @@ func runTests(t *testing.T) {
 	if driver == `msqb.Driver` {
 		testUpsertSeparate(t)
 		testInsert(t)
+		testInsertSubQuery(t)
 		testUpsertSeparate(t)
 	} else {
 		testUpsert(t)
 		testInsert(t)
+		testInsertSubQuery(t)
 		testUpsert(t)
 	}
 	if driver == `pgqb.Driver` {
@@ -179,6 +181,26 @@ func testInsert(test *testing.T) {
 	tx.MustCommit()
 }
 
+func testInsertSubQuery(test *testing.T) {
+	o := model.One()
+	sq := o.Select(o.ID, qb.Value(1), qb.Value(`Test comment sq`))
+
+	t := model.Two()
+
+	tx := db.MustBegin()
+
+	q := t.Insert(t.OneID, t.Number, t.Comment).
+		SubQuery(sq).
+		Values(1, 2, `Test comment 2`)
+
+	res := tx.MustExec(q)
+
+	assert := assert.New(test)
+	assert.Eq(int64(2), res.MustRowsAffected())
+
+	tx.MustCommit()
+}
+
 func testUpdate(test *testing.T) {
 	t := model.Two()