使用日期筛选SQL Server中的记录

Question

我需要选择所有不超过18个月的记录。 我为SQL Server编写了此查询。 但这似乎不起作用。

SELECT DISTINCT Company, 
        Name,
        PhoneNumber,
FROM        Request
WHERE       Company  LIKE @Company
AND     RequestDate >= ADD_MONTHS(SYSDATE, -18)

Answer 1

SELECT DISTINCT Company,  
        Name, 
        PhoneNumber, 
FROM        Request 
WHERE       Company  LIKE @Company 
AND     datediff(mm, RequestDate, getdate()) <= 18

为此使用DATEDIFF函数 。 上面的查询应该为您提供所需的结果。

Answer 2

SELECT DISTINCT Company, Name, PhoneNumber, 
FROM Request WHERE Company LIKE @Company 
AND RequestDate >= DATEADD(MONTH, -18, GETDATE())