MySQL連接兩個表並從兩個表中求和

Question

我有兩個表 & 需要兩個表中的列總和，我嘗試但無法得到結果

表 1 交貨：

表 - 集合：

我的內部連接查詢是：

SELECT loan_collection.coll_date,
       sum(loan_collection.coloan_amo) AS coloan_amo,
       sum(loan_collection.sc_coll) AS sc_coll,
       sum(loan_collection.total_coll) AS total_coll,
       loan_collection.year,
       bag_del_rentcoll.rent_bagdel,
       bag_del_rentcoll.rent_amo,
       bag_del_rentcoll.booking,
       bag_del_rentcoll.rent_rece
FROM loan_collection AS loan_collection
INNER JOIN
  (SELECT del_date,
          sum(rent_bagdel) AS rent_bagdel,
          sum(rent_amo) AS rent_amo,
          sum(booking) AS booking,
          sum(rent_rece) AS rent_rece
   FROM bag_del_rentcoll) AS bag_del_rentcoll
GROUP BY loan_collection.coll_date

結果是： 如您所見，它是表二中所有內容的總和。 我怎樣才能得到結果

謝謝。

Answer 1

先聚合，后加入。 我想你想加入del_date = coll_date 。 這是完整的查詢：

SELECT 
  lc.coll_date,
  lc.sum_coloan_amo,
  lc.sum_sc_coll,
  lc.sum_total_coll,
  lc.max_year,
  bdr.sum_rent_bagdel,
  bdr.sum_rent_amo,
  bdr.sum_booking,
  bdr.sum_rent_rece 
FROM 
(
  SELECT
    coll_date,
    SUM(coloan_amo) AS sum_coloan_amo
    SUM(sc_coll) AS sum_sc_coll,
    SUM(total_coll) AS sum_total_coll,
    MAX(year) AS max_year
  FROM loan_collection
  GROUP BY coll_date
) lc
INNER JOIN
(
  SELECT 
    del_date,
    sum(rent_bagdel) AS sum_rent_bagdel,
    sum(rent_amo) AS sum_rent_amo,
    sum(booking) AS sum_booking,
    sum(rent_rece) AS sum_rent_rece
  FROM bag_del_rentcoll
  GROUP BY del_date
) bdr ON bdr.del_date = lc.coll_date;