Sql 使用计数基于联接表限制行

我有一个employee表和一个vacations表，其中每一行代表他们休假的一天

我想让所有休假天数超过其最大休假天数价值的员工都参与进来

employees:
employeeId
maxVacationDays

vacations:
employeeId
date_vacation_day_taken

我现在的问题是：

SELECT e.*
FROM employees e
         INNER JOIN vacations v ON (v.employeeId = e.employeeId)
WHERE e.isActive = true AND ( ???? > e.maxVacationDays)

所以我需要从休假表中获取该员工ID的行数

我需要一个子查询吗

（使用sql2000）

尝试以下操作：

SELECT * FROM 
(
    SELECT e.employeeId, e.maxVacationDays, 
           SUM(v.date_vacation_day_taken) 'dayscount'
    FROM employees e
    INNER JOIN vacations v ON (v.employeeId = e.employeeId)
    GROUP BY e.employeeId, e.maxVacationDays
    WHERE e.isactive = true
) sub
WHERE sub.dayscount > e.maxVacationDays)

SELECT e.employeeId, v.maxVacationDays
FROM employees e
         INNER JOIN vacations v ON (v.employeeId = e.employeeId)
WHERE e.isActive = true
GROUP BY e.employeeId, v.maxVacationDays
HAVING COUNT(v.employeeId) > v.maxVacationDays

试试这个：

SELECT * FROM 
(
    SELECT e.employeeId, e.maxVacationDays, 
           SUM(v.date_vacation_day_taken) 'dayscount'
    FROM employees e
    INNER JOIN vacations v ON (v.employeeId = e.employeeId)
    GROUP BY e.employeeId, e.maxVacationDays
    WHERE e.isactive = true
) sub
WHERE sub.dayscount > e.maxVacationDays)

SELECT e.employeeId, v.maxVacationDays
FROM employees e
         INNER JOIN vacations v ON (v.employeeId = e.employeeId)
WHERE e.isActive = true
GROUP BY e.employeeId, v.maxVacationDays
HAVING COUNT(v.employeeId) > v.maxVacationDays

也许是这样：

select e.employeeId, e.maxVacationDays, count(v.*) as vacationDaysTaken
from employees e
    join vacations v on e.employeeId = v.employeeId
group by e.employeeId, e.maxVacationDays
having e.maxVacationDays < count(v.*)

选择e.employeeId，e.maxVacationDays，将（v.*）计为vacationDaysTaken
来自雇员
加入e.employeeId=v.employeeId上的假期
按e.employeeId、e.maxVacationDays分组
e.maxVacationDays<计数（v.*）的

可能是这样的：

select e.employeeId, e.maxVacationDays, count(v.*) as vacationDaysTaken
from employees e
    join vacations v on e.employeeId = v.employeeId
group by e.employeeId, e.maxVacationDays
having e.maxVacationDays < count(v.*)

选择e.employeeId，e.maxVacationDays，将（v.*）计为vacationDaysTaken
来自雇员
加入e.employeeId=v.employeeId上的假期
按e.employeeId、e.maxVacationDays分组
e.maxVacationDays<计数（v.*）的

试试这个：

SELECT * FROM 
(
    SELECT e.employeeId, e.maxVacationDays, 
           SUM(v.date_vacation_day_taken) 'dayscount'
    FROM employees e
    INNER JOIN vacations v ON (v.employeeId = e.employeeId)
    GROUP BY e.employeeId, e.maxVacationDays
    WHERE e.isactive = true
) sub
WHERE sub.dayscount > e.maxVacationDays)

SELECT e.employeeId, v.maxVacationDays
FROM employees e
         INNER JOIN vacations v ON (v.employeeId = e.employeeId)
WHERE e.isActive = true
GROUP BY e.employeeId, v.maxVacationDays
HAVING COUNT(v.employeeId) > v.maxVacationDays

试试这个：

SELECT * FROM 
(
    SELECT e.employeeId, e.maxVacationDays, 
           SUM(v.date_vacation_day_taken) 'dayscount'
    FROM employees e
    INNER JOIN vacations v ON (v.employeeId = e.employeeId)
    GROUP BY e.employeeId, e.maxVacationDays
    WHERE e.isactive = true
) sub
WHERE sub.dayscount > e.maxVacationDays)

SELECT e.employeeId, v.maxVacationDays
FROM employees e
         INNER JOIN vacations v ON (v.employeeId = e.employeeId)
WHERE e.isActive = true
GROUP BY e.employeeId, v.maxVacationDays
HAVING COUNT(v.employeeId) > v.maxVacationDays