sql - 批量插入数据

insert into t (c1, c2, c3) values (1, 1, 1), (2, 2, 2)

insert into t (c1, c2, c3) (select a1, a2, a3) union all (select b1, b2, b3)

insert into t (c1, c2, c3) (select a1, a2, a3 from t2)