Question

我有以下观点

CREATE VIEW dbo.vw_IssueDates AS 
SELECT UserId,
       IssueDate

FROM users 
WHERE IssueDATE <= CONVERT(DATE,  '2015-01-20')
GO
SELECT * FROM dbo.vw_IssueDates

我正在尝试超过30天的优秀罚款列表用户，我知道它将动态涉及GETDATE（所以今天的日期）并减去30但不知道从哪里开始？

Answer 1

使用DATEADD(day,-30,GETDATE())

SELECT UserId, IssueDate
FROM users
WHERE IssueDate >= DATEADD(day,-30,GETDATE())

此外，如果您希望在列中显示超过多少天...

SELECT UserId, IssueDate, DATEDIFF(day,IssueDate,GETDATE()) AS DaysOverDue
FROM users
WHERE IssueDate >= DATEADD(day,-30,GETDATE())

Answer 2

解决此问题的另一种方法是使用datediff函数。您可以这样做：

CREATE VIEW dbo.vw_IssueDates AS 
SELECT UserId,
       IssueDate
FROM users 
WHERE DATEDIFF(day,IssueDATE,getdate()) > 30
GO
SELECT * FROM dbo.vw_IssueDates

查看SQL - 减去日期

2 个答案: