Question

在每一行中，我有一个列数量（float）和id（int）。所以我想通过联接来添加库存中table1到table2数量相同id的数量总和。实施例。

我的SQL信息

    Table 1                   Table 2
 id   quantities           id    quantities
 1        1                 1         0  
 1        2                 2         0
 2        4                 3         0 
 2        1         
 3        7

我想从表1和连接中总计数量，将其添加到表2中

表2所需的结果

    Table 1                   Table 2
 id   quantities           id    quantities
 1        1                 1         3  
 1        2                 2         5
 2        4                 3         7
 2        1         
 3        7

我尝试使用此代码，但只添加第一行

update i set quantities=i.quantities+sum(s.rent) from inventory i join temp_rent s on i.id=s.itemid

Answer 1

简单的JOIN和聚合应该可以解决问题

Update Table2
   set quantities = B.Total
 From  Tabel2 A
 Join (Select ID
             ,Total=sum(quantities)
       From  Table1
       Group By ID
      ) B
  on (A.ID=B.ID)

Answer 2

这应该......

CREATE TABLE #table1 ( id INT, quantities INT)

INSERT INTO #table1(id, quantities)
VALUES (1, 1)   
INSERT INTO #table1(id, quantities)
VALUES (1, 2)       
INSERT INTO #table1(id, quantities)
VALUES (2, 4)       
INSERT INTO #table1(id, quantities)
VALUES (2, 1)       
INSERT INTO #table1(id, quantities)
VALUES (3, 7)       

CREATE TABLE #table2 ( id INT, quantities INT)

INSERT INTO #table2(id, quantities)
VALUES (1, 0)   
INSERT INTO #table2(id, quantities)
VALUES (2, 0)       
INSERT INTO #table2(id, quantities)
VALUES (3, 0)   

UPDATE #table2
SET quantities = t1.quantities
FROM #table2 t2
    JOIN (
            SELECT id, SUM(quantities) AS quantities
            FROM #table1 
            GROUP BY id
        ) t1 ON
        t2.id = t1.id

DROP TABLE #table1
DROP TABLE #table2

使用join更新每个sql server行

2 个答案: