MySQL、Spark SQL 嵌套查询(二层、三层、多层)
二层查询
select * from(select * from(select substring(``,1,3) from `big1`)t1 join
(select substring(``,1,3) from `big2`)t2 on 1=1)tt
where tt.aa>3
三层查询
select * from(select * from(select substring(``,1,3) from `big1`)t1 join
(select * from (select substring(``,1,3) from `big2`)t2 join
(select substring(``,1,3) from `big3`)t3 on 1=1
)t4 on 1=1)tt
where tt.aa>3