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?
最佳答案
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
关于连接的 SQL 限制,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33964884/