hive多表查询的条件写在join里好还是用子查询？
两个表关联查询，是把条件都写join on里好？
select a.* from a join b on ( a.id = b.id and a.a = 2 and b.c = 3)
还是写成子查询的形式比较快？
select a.* from a join (select b.* from b where b.c = 3) c on (a.id = c.id) where a.a = 2
hive多表查詢的條件寫在join里好還是用子查詢？
qq_唐宋元明清_4
2018-08-29 07:37:58