本文介绍了不能使用最小值、最大值等SQL Server 2012的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有这样的查询：
select
FirstName, LastName, BirthDate,
GETDATE() AS [Today],
CAST (DATEDIFF (DD, BirthDate, GETDATE())/365.25 AS INT) AS [Age]
FROM
Employees
WHERE CAST (DATEDIFF (DD, BirthDate, GETDATE())/365.25 AS INT) >=55
ORDER BY LastName ASC
我想找到最大、最小和平均的年龄，我认为我可以做到这一点，但显然我做不到。如何才能做到这一点？
select
FirstName, LastName, BirthDate,
GETDATE() AS [Today],
CAST (DATEDIFF (DD, BirthDate, GETDATE())/365.25 AS INT) AS [Age],
MIN (DATEDIFF (DD, BirthDate, GETDATE())/365.25 AS INT)
FROM
Employees
WHERE
CAST (DATEDIFF (DD, BirthDate, GETDATE())/365.25 AS INT) >=55
ORDER BY
LastName ASC
错误：
消息195，级别15，州10，第5行
"min"不是可识别的内置函数名。
推荐答案
这是我找到的解决方案。感谢大家的帮助！
SELECT
MAX (CAST (DATEDIFF (DD, BirthDate, GETDATE())/365.25 AS INT)) AS [The Biggest Age]
, MIN (CAST (DATEDIFF (DD, BirthDate, GETDATE())/365.25 AS INT)) AS [The Smallest Age]
, AVG (CAST (DATEDIFF (DD, BirthDate, GETDATE())/365.25 AS INT)) AS [The Average Age]
FROM
Employees
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