Question

我想制作一个view来查找字符库存中前5个最高数量的商品，还有一个列显示其他人也有该商品的数量。

CHARACTERS
- CHARID PK
INVENTORY
- ITEMID
- CHARID
- 量
ITEM
- ITEMID

这是我到目前为止所得到的，

CREATE VIEW vwPopItems --Top 5 most popular items
AS
SELECT TOP 5 INVENTORY.itemID, CHARACTERS.charName,quantity,
       (SELECT COUNT(*) FROM INVENTORY where INVENTORY.itemID =) as cnt
FROM INVENTORY
JOIN CHARACTERS
ON CHARACTERS.charID = INVENTORY.charID
WHERE INVENTORY.charID = 6
GO

而是将count显示为该表中没有WHERE的所有记录，因此我需要制作一个WHERE，只显示前5个特定项目的$("button").click(function(){ // add button click event var value = $("#concept_name").val(); if(value.length > 50){ alert("Maximum limit is 50 character"); return false; // it will not submit form if return false }else{ alert("Form will be submitted"); return true; } });同样具有该项目的字符数量。知道上面的错误但是你们能告诉我该怎么做才能解决它吗？ :)

Answer 1

只需使用COUNT(*)而不是子查询。然后使用TOP和ORDER BY to get the TOP` 5。

SELECT TOP(5)
    i.itemID,
    c.charName,
    i.quantity,
    COUNT(*) AS cnt
FROM INVENTORY i
INNER JOIN CHARACTERS c
    ON c.charID = i.charID
WHERE
    i.charID = 6
GROUP BY 
    i.itemID,
    c.charName,
    i.quantity,
ORDER BY cnt DESC

Answer 2

SELECT EMPLOYEE_ID, salary, department_id
FROM   employees E
WHERE salary > (SELECT AVG(salary)
                FROM   EMP T
                WHERE E.department_id = T.department_id)

不知道在哪里放置子查询中的位置

2 个答案: