从两个不同的表中添加两列

Question

I have two tables with same field types. Fields that are common in here are *BG_ID* and Store Number . Now I want to SUM two columns (*total_area* and *total_area_blk*) from two tables and group them by BG_ID .

The following is what I tried which doesnt work:

 select t.bg_id, t.store_number,sum(a.total_area),sum(b.total_area_blk)
 from (select bg_id,store_number,total_area
 from temp_Prop_area_block a
 where store_number='33665'
 union all
 select bg_id,store_number,total_area_blk 
 from temp_Prop_area_BG b
 where store_number='33665')

Answer 1

Hope, this helps you!

SELECT bg_id,  store_number,  SUM(total_area)
FROM
  (
    SELECT bg_id,  store_number,  total_area as total_area
    FROM temp_Prop_area_block a
    WHERE store_number='33665'
    UNION ALL
    SELECT bg_id,   store_number,  total_area_blk as total_area
    FROM temp_Prop_area_BG b
    WHERE store_number='33665'
  ) my_view
GROUP BY bg_id, store_number;