sql - 使用 SQL 选择最后付款日期

Question

我如何使用 SQL 获取最后一笔付款

例子：

SELECT DATEOFPAYMENT
FROM PAYMENTS
WHERE DATEOFPAYMENT = (SELECT MAX(DATEOFPAYMENT) FROM PAYMENTS)

但这不起作用，因为它抱怨要求分组？

Answer 1

SELECT DATEOFPAYMENT
FROM PAYMENTS
WHERE DATEOFPAYMENT = (SELECT MAX(DATEOFPAYMENT) FROM PAYMENTS GROUP BY DATEOFPAYMENT);

Answer 2

如果只需要一个字段，为什么需要子查询？

select max(DateOfPayment)
FROM Payments

如果您想要“最后一次付款”中的所有数据

select p.Id, p.DateOfPayment, p.Name -- don't know your fields, just an example
FROM Payments p
INNER JOIN (select Id, MAX(DateOfPayment) maxdate
            FROM Payments
            GROUP BY Id) as m
  ON m.Id = p.Id and p.DateOfPayment = m.maxdate

如果您只想要其他字段，并且这些其他字段具有最大 dateOfPayment，则不在聚合函数中的所有字段都必须在 GROUP BY 子句中

select p.Id, p.Name, max(p.DateOfPayment)
From Payments p
GROUP BY p.Id, p.Name

Answer 3

我通常会使用TOPand ORDER BY。

SELECT TOP 1 DATEOFPAYMENT
FROM PAYMENTS
ORDER BY DATEOFPAYMENT DESC

或获取整个记录：

SELECT TOP 1 *
FROM PAYMENTS
ORDER BY DATEOFPAYMENT DESC

Answer 4

SELECT TOP 1 DATEOFPAYMENT
FROM PAYMENTS
ORDER BY DATEOFPAYMENT DESC

Answer 5

cluase 使用的所有聚合函数：

SELECT DATEOFPAYMENT FROM PAYMENTS WHERE DATEOFPAYMENT = (SELECT MAX(DATEOFPAYMENT) FROM PAYMENTS group by DATEOFPAYMENT)

Answer 6

你有 2 个选项，选择 MAX 值

select max(DateOfPayment) FROM Payments

或按 DateOfPayment desc 选择前 1 个 DateOfPayment 订单

运行两者，检查计划和性能并选择最好的一个:)

Answer 7

如果您只是想要它只是在询问最后一次付款

从付款中选择 MAX（付款日期）作为付款日期

或者例如，如果您想要一个列出每位员工最后一次获得报酬的列表，您将使用

SELECT MAX(dateofpayment) 从 Payment GROUP BY EmployeeID

要求您分组的原因是因为您使用的是聚合函数