MySQL-如何过滤和显示组中的最大值?
我创建了以下查询,该查询将为我提供数据库中所有门店的销售数据:MySQL-如何过滤和显示组中的最大值?,mysql,sql,Mysql,Sql,我创建了以下查询,该查询将为我提供数据库中所有门店的销售数据: SELECT s.shopname AS "Store", e.empname AS "Employee", e1.empname AS "Manager", SUM(p.amount) AS "Total Sales" FROM fss_Shop s JOIN fss_Employee e ON e.shopid = s.shopid JOIN fss_Paym
SELECT s.shopname AS "Store",
e.empname AS "Employee",
e1.empname AS "Manager",
SUM(p.amount) AS "Total Sales"
FROM fss_Shop s
JOIN fss_Employee e ON e.shopid = s.shopid
JOIN fss_Payment p ON p.empnin = e.empnin
JOIN fss_Employee e1 ON e1.empnin = e.mgrnin
GROUP BY e.empname, e.shopid
查询执行并返回数据。它应该给我每个商店的顶级销售人员,以及从查询中可以看到的其他数据
我遇到的问题是,对于某些商店,它返回的员工不止一人,而“总销售额”明显不同。例如,对于商店A,它将返回John(销售额=1000英镑)和Martin(销售额=2000英镑)。我希望它只返回销售价值最高的员工
如何更改查询,使其仅返回每家店铺销售额最高的员工
下面的链接将让您了解这些表的外观:
一种可能的解决方案是使用
拥有和全部
SELECT s.shopname AS "Store",
e.empname AS "Employee",
e1.empname AS "Manager",
SUM(p.amount) AS "Total Sales"
FROM fss_Shop s
JOIN fss_Employee e ON e.shopid = s.shopid
JOIN fss_Payment p ON p.empnin = e.empnin
JOIN fss_Employee e1 ON e1.empnin = e.mgrnin
GROUP BY e.empname, s.shopid
HAVING SUM(p.amount) >= ALL(
SELECT SUM(p.amount)
FROM fss_Employee e
JOIN fss_Payment p ON p.empnin = e.empnin
WHERE e.shopid = s.shopid
GROUP BY e.empname
)
如果ALL
对您不起作用。你可以这样改变它
SELECT s.shopname AS "Store",
e.empname AS "Employee",
e1.empname AS "Manager",
SUM(p.amount) AS "Total Sales"
FROM fss_Shop s
JOIN fss_Employee e ON e.shopid = s.shopid
JOIN fss_Payment p ON p.empnin = e.empnin
JOIN fss_Employee e1 ON e1.empnin = e.mgrnin
GROUP BY e.empname, e.shopid
HAVING SUM(p.amount) = (
SELECT MAX(t.samount)
FROM
(
SELECT SUM(p.amount) samount
FROM fss_Employee emp
JOIN fss_Payment p ON p.empnin = emp.empnin
WHERE emp.shopid = e.shopid
GROUP BY emp.empname
) t
)
好的,下一个版本将避免在
FROM的后面出现相关子查询
SELECT s.shopname AS "Store",
e.empname AS "Employee",
e1.empname AS "Manager",
SUM(p.amount) AS "Total Sales"
FROM fss_Shop s
JOIN fss_Employee e ON e.shopid = s.shopid
JOIN fss_Payment p ON p.empnin = e.empnin
JOIN fss_Employee e1 ON e1.empnin = e.mgrnin
GROUP BY e.empnin, e.shopid
HAVING (e.shopid, SUM(p.amount)) IN
(
SELECT t.shopid, MAX(t.samount)
FROM
(
SELECT emp.shopid, SUM(p.amount) samount
FROM fss_Employee emp
JOIN fss_Payment p ON p.empnin = emp.empnin
GROUP BY emp.empname, emp.shopid
) t
GROUP BY t.shopid
)
查询是否真的像编写的那样运行正常?您正在将e.shopid按
放入组中,但它没有出现在SELECT
子句中的任何位置。在您的查询中,它在哪里指定您只希望返回最大值?其中一个表应该已经有了销售额最高的销售人员吗?@PatJones是的,它正在运行我刚刚测试过它现在你有fss_付款模式吗?@PatJones是的,刚刚更新了它。在第10行有'LIMIT 0,25'的语法错误
我在query中没有限制它说发现了两个错误无法识别的关键字。(位置337的“全部”附近)
意外标记。(靠近)(“位置340)
RemovingALL
删除语法错误,但是MySQL给出另一个错误,说子查询返回多行
@holdtheck尝试第二个版本