连接的 SQL 限制

Question

我在获取下一个查询的第一行时遇到了问题:

Select mar.Title MarketTitle, ololo.NUMBER, ololo.Title from Markets mar
JOIN( 
    Select emp.Employee_ID, emp.Market_id, ppp.Title, ppp.NUMBER from Employees emp
    JOIN(
    select pur.Employee_id Empl,Pro.Title Title, COUNT(pur.Product_id) NUMBER from Purchase pur
    LEFT JOIN  
        Payments pay ON pay.Payment_ID = pur.Payment_ID AND pay.Date > DATEADD(month, -1, GETDATE())
    RIGHT JOIN Products pro
    ON pur.Product_id = pro.Product_ID
    GROUP BY Pro.Title, pur.Employee_id) ppp ON ppp.Empl = emp.Employee_id) ololo
ON mar.Market_ID = ololo.Market_id
ORDER BY NUMBER DESC

我尝试了很多插入“limit 1”的组合，但都出错了。谁能帮忙？

Answer 1

LIMIT 不适用于 SQL Server。

使用TOP 1相反:

SELECT TOP 1 mar.Title MarketTitle, ololo.NUMBER, ololo.Title from Markets mar
JOIN( 
    Select emp.Employee_ID, emp.Market_id, ppp.Title, ppp.NUMBER from Employees emp
    JOIN(
    select pur.Employee_id Empl,Pro.Title Title, COUNT(pur.Product_id) NUMBER from Purchase pur
    LEFT JOIN  
        Payments pay ON pay.Payment_ID = pur.Payment_ID AND pay.Date > DATEADD(month, -1, GETDATE())
    RIGHT JOIN Products pro
    ON pur.Product_id = pro.Product_ID
    GROUP BY Pro.Title, pur.Employee_id) ppp ON ppp.Empl = emp.Employee_id) ololo
ON mar.Market_ID = ololo.Market_id
ORDER BY NUMBER DESC

或OFFSET-FETCH使用 SQL Server 2012+:

SELECT  mar.Title MarketTitle, ololo.NUMBER, ololo.Title from Markets mar
JOIN( 
    Select emp.Employee_ID, emp.Market_id, ppp.Title, ppp.NUMBER from Employees emp
    JOIN(
    select pur.Employee_id Empl,Pro.Title Title, COUNT(pur.Product_id) NUMBER from Purchase pur
    LEFT JOIN  
        Payments pay ON pay.Payment_ID = pur.Payment_ID AND pay.Date > DATEADD(month, -1, GETDATE())
    RIGHT JOIN Products pro
    ON pur.Product_id = pro.Product_ID
    GROUP BY Pro.Title, pur.Employee_id) ppp ON ppp.Empl = emp.Employee_id) ololo
ON mar.Market_ID = ololo.Market_id
ORDER BY NUMBER DESC
OFFSET 0 ROWS
FETCH FIRST 1 ROW ONLY