hive list records which do not match in other table

Question

Reg                      Global
ID | uom                 ID  | uom    
------------------           ----------------
1  | kg                   1  | kg
1  | gm                   1  | gm
1  | ml                   3  | pl
3  | pl                    

Required Output : r_glob

ID | reg    | glob   
------------------  
1  | ml      | null  

Tried query:

SELECT TA.id,  TB.UOM  
FROM TB
LEFT JOIN TA
ON TB.id=TA.id  
WHERE  TA.id like '8' 
GROUP BY TA.id ,  TB.UOM;

Output: r_glob

ID | reg        
------------------  
1  | kg  
1  | gm      

Answer 1

使用左外连接并检查表Global中的列中的空值。

select Reg.ID, Reg.uom as reg, Global.uom as glob
from Reg
left outer join Global on Reg.ID = Global.ID and Reg.uom = Global.uom
where Global.ID is null