蜂巢連接查詢性能

Question

我想留在A.id = B.id加入爲B表A象下面這樣：

select A.id,B.name from (select * from TABLEa)A 
LEFT JOIN (select * from TABLEb where partition IN ('GOP','LOP')B on A.id=B.id 

這裏我TABLEB由兩個值GOP和LOP分區。

我也試着做下面的方法相同的查詢：

insert overwrite table final 
select A.id,B.name from (select * from TABLEa)A 
LEFT JOIN (select * from TABLEb where partition IN ('GOP')B on A.id=B.id; 
insert INTOtable final 
select A.id,B.name from (select * from TABLEa)A 
LEFT JOIN (select * from TABLEb where partition IN ('LOP')B on A.id=B.id; 

任何機構可以告訴哪種做法更好呢？以及原因或與第一次不同的原因。

請幫助

Answer 1

select 
    A.id, 
    B.name 
from 
    TABLEa as A 
    LEFT JOIN TABLEb as B on partition IN ('GOP','LOP') and A.id=B.id