Question

可能重复：
How to calculate age in T-SQL with years, months, and days

我在Sql Server 2005上遇到了年龄计算问题。我有一个客户表，其日期为birth column。我想要的是创建一个age column的视图，这个age column应该通过从今天减去出生日期来显示person的年龄（非常简单）。

我在这里找到了一些很好的资源，但我想要的是按年和月显示年龄。例如（47岁，3个月）。这意味着我希望同时具有年和月值，并且我想将string（'years', 'yrs', 'y', 'months', 'mon', 'm', ...}添加到适当的值并将其显示为例如。（25 years, 2 months）。如果此人的年龄仅为3 months，则应显示＆＃39; 3 months＆＃39;而不是'0 years, 3 months＆＃39;。

如果此人的年龄是几年而没有任何月份，则应显示例如。＆＃39; 5 years＆＃39;不是'5 years, 0 months＆＃39;

哦，我已经使用c＃完成了这个，但我想在sql视图上创建一个列，这样我就可以使用视图填充我的gridview，而无需对我的c＃代码进行任何计算。如果有帮助我可以在这里发布我的c＃代码。感谢

Answer 1

我认为您应该考虑使用该解决方案的本地化问题（以及不同的标准来计算不同国家/地区的年龄）。如果你不关心，你可以：

编写SQL标量函数来计算年龄（参见these posts on MSDN）。
编写C＃函数并将其集成到SQL Server中（请参阅this article on SQLTeam）。

Answer 2

你需要这样的东西：

SELECT *,
  case when DATEDIFF(MONTH, Birthday, GETDATE()) < 12
  then 
    CONVERT(nvarchar(16), DATEDIFF(MONTH, Birthday, GETDATE())) + ' months'
  else 
    CONVERT(nvarchar(16), DATEDIFF(YEAR, Birthday, GETDATE())) + ' years, ' + 
    CONVERT(nvarchar(16), DATEDIFF(MONTH, Birthday, GETDATE()) % 12 ) + ' months'
  end 
FROM dbo.CUSTOMER

Answer 3

也许是这样的：

测试数据

DECLARE @tbl TABLE(birthDay DATETIME)
INSERT INTO @tbl
VALUES
    ('2004-04-05'),
    ('2001-02-05')

<强>查询

;WITH Years
AS
(   
    SELECT
        DATEDIFF(yy, tbl.birthDay, GETDATE()) - CASE WHEN (MONTH(tbl.birthDay) > MONTH(GETDATE())) OR (MONTH(tbl.birthDay) = MONTH(GETDATE()) AND DAY(tbl.birthDay) > DAY(GETDATE())) THEN 1 ELSE 0 END AS Years,
        tbl.birthDay
    FROM
        @tbl AS tbl 
), BithDayWithMonth
AS
(
    SELECT
        Years.Years,
        DATEDIFF(m, years.tmp, GETDATE()) - CASE WHEN DAY(Years.birthDay) > DAY(GETDATE()) THEN 1 ELSE 0 END AS Months
    FROM
        (
            SELECT
                DATEADD(yy, Years.Years, Years.birthDay) AS tmp,
                Years.Years,
                Years.birthDay
            FROM
                Years
        ) AS years
)
SELECT
    (CASE WHEN BithDayWithMonth.Years=0 THEN '' ELSE CAST(BithDayWithMonth.Years AS VARCHAR(10))+' years' END)+
    (CASE WHEN BithDayWithMonth.Months=0 THEN '' ELSE (CASE WHEN NOT BithDayWithMonth.Years=0 THEN ', ' ELSE '' END) +
    CAST(BithDayWithMonth.Years AS VARCHAR(10))+' months' END)
FROM
    BithDayWithMonth

Answer 4

CREATE FUNCTION format_age(
    @DOB datetime,
    @now datetime
)
RETURNS nvarchar(30)
BEGIN
    DECLARE @years int, @months int;
    IF @DOB > @now RETURN N'not born yet';
    SET @years = DATEDIFF(year, @DOB, @now);
    IF MONTH(@DOB) * 100 + DAY(@DOB) > MONTH(@now) * 100 + DAY(@now)
        SET @years = @years - 1;
    SET @months = DATEDIFF(month, DATEADD(year, @years, @DOB), @now);
    IF DAY(@DOB) > DAY(@now)
        SET @months = @months - 1;
    RETURN CASE
        WHEN @years = 0 THEN CONVERT(nvarchar(30), @months) + N' months'
        WHEN @months = 0 THEN CONVERT(nvarchar(30), @years) + N' years'
        ELSE CONVERT(nvarchar(30), @years) + N' years, ' +
            CONVERT(nvarchar(30), @months) + N' months'
    END;
END
GO

SELECT '2011-02-16' as dt, dbo.format_age('2011-02-16', '2012-03-16') as age
UNION
SELECT '2011-03-16', dbo.format_age('2011-03-16', '2012-03-16')
UNION
SELECT '2011-03-17', dbo.format_age('2011-03-17', '2012-03-16')
UNION
SELECT '2012-03-16', dbo.format_age('2012-03-16', '2012-03-16')
UNION
SELECT '2012-03-17', dbo.format_age('2012-03-17', '2012-03-16')

dt          age
2011-02-16  1 years, 1 months
2011-03-16  1 years
2011-03-17  11 months
2012-03-16  0 months
2012-03-17  not born yet

参考日期为2012-03-16

计算并显示Sql Server上的Age列为（xx年，xx个月）

4 个答案: