Question

我有两张桌子

table1:itemTbale
table2:itemDetails


itemTable contain
id | itemName

itemDetails
id | itemID | price | details

表可能包含这样的数据

  id | itemName
   1    Vechile
   2    Fruits


id | itemID | price | details
1      1      80$     bla bla
2      1      150$    bla bla bla
3      1      200$    bla bla
4      2       5$      ..
5      2       8$     ..bla
6      2       7$      bla..

现在我必须为每个itemID选择最高项目详细信息

LIKE

 id | itemID | price | details  |itemName
 1     1       80$      bla bla   Vechile
 4     2        5$      ..        Fruits.

我对查询感到困惑。请帮助我提前谢谢。

Answer 1

;WITH MyCTE AS
(
    SELECT D.id,
           D.itemID,
           D.price,
           D.details,
           T.itemName,
           ROW_NUMBER() OVER(PARTITION BY D.itemID ORDER BY D.id) AS row_num
    FROM   itemTable T
           JOIN itemDetails D
               ON T.id = D.itemId
)

SELECT id,
       itemID,
       price,
       details,
       itemName
FROM   MyCTE
WHERE  row_num = 1

查看this FIDDLE

如何使用两个表选择最高值

1 个答案: