如何获得最大列使用SQL？

-1

我有一张桌子，年份，月份，日期如下。如何获得最大列使用SQL？

Year  Month Day 
2015  10 28 
2015  10 29 
2015  10 29 
2015  10 30 
2015  10 30 
2015  10 30 
2015  11 4 
2015  11 5 
2015  11 9 
2015  11 19 
2016  1  31 
2016  4  1

我想获得最高的一年，在这一年，那年的一天，相应的最高的月份，月柱

输出：

2016 4 1

如果表没有按'不包含 2016 1 31 2016 4 1

行的输出将是 2015 11 19个

来源

2015-12-02 Dheeraj Patnaik

你的意思是你想每年的最新日期？ –

为什么不以desc命令？ –

DECLARE @temp TABLE 
(
    Y SMALLINT, 
    M TINYINT, 
    D TINYINT, 
    PRIMARY KEY CLUSTERED (Y DESC, M DESC, D DESC) WITH(IGNORE_DUP_KEY=ON) 
) 

INSERT INTO @temp (Y, M, D) 
VALUES 
    (2015, 10, 28), (2015, 10, 29), 
    (2015, 10, 29), (2015, 10, 30), 
    (2015, 10, 30), (2015, 10, 30), 
    (2015, 11, 4), (2015, 11, 5), 
    (2015, 11, 9), (2015, 11, 19), 
    (2016, 1 , 31), (2016, 4 , 1) 

SELECT TOP(1) * 
FROM @temp 
ORDER BY Y DESC, M DESC, D DESC

结果 -

Y  M D 
------ ---- ---- 
2016 4 1

来源

2015-12-02 11:05:10 Devart

可以在SQL中使用最多的功能。

SELECT max(Year) as Year, Month, Day FROM table_name.

希望得到这个帮助！

来源

2015-12-02 11:10:15

选中此示例。

DECLARE @temp TABLE 
(
    Y SMALLINT, 
    M TINYINT, 
    D TINYINT, 
    PRIMARY KEY CLUSTERED (Y DESC, M DESC, D DESC) WITH(IGNORE_DUP_KEY=ON) 
) 

INSERT INTO @temp (Y, M, D) 
VALUES 
    (2015, 10, 28), (2015, 10, 29), 
    (2015, 10, 29), (2015, 10, 30), 
    (2015, 10, 30), (2015, 10, 30), 
    (2015, 11, 4), (2015, 11, 5), 
    (2015, 11, 9), (2015, 11, 19), 
    (2016, 1 , 31), (2016, 4 , 1) 

; with cte as 
(
    select cast (cast (y as varchar(15)) +'-' + cast (m as varchar(15)) + '-' + cast (m as varchar(15)) as date) dt , y , m, d 
    from @temp 
) 
select top 1 y,m,d from cte order by dt desc 

delete @temp where y = '2016' 

; with cte as 
(
    select cast (cast (y as varchar(15)) +'-' + cast (m as varchar(15)) + '-' + cast (m as varchar(15)) as date) dt , y , m, d 
    from @temp 
) 
select top 1 y,m,d from cte order by dt desc

来源

2015-12-02 11:14:18 Ajay2707

如果你一定值代表有效日期，您可以将它们转换为日期，并获得最大的是：

SELECT DATEPART(year, MAX(CAST(Y as varchar(4)) + RIGHT('0' + CAST(M AS varchar(2)), 2) + RIGHT('0' + CAST(D AS varchar(2)), 2))), 
    DATEPART(month, MAX(CAST(Y as varchar(4)) + RIGHT('0' + CAST(M AS varchar(2)), 2) + RIGHT('0' + CAST(D AS varchar(2)), 2))), 
    DATEPART(dd, MAX(CAST(Y as varchar(4)) + RIGHT('0' + CAST(M AS varchar(2)), 2) + RIGHT('0' + CAST(D AS varchar(2)), 2))) 
FROM @temp

来源

2015-12-02 11:15:42

下面是该查询（更换你的表名）

SELECT TOP 1 YEAR, MONTH, DAY 
FROM YOUR_TABLE 
ORDER BY YEAR DESC, MONTH DESC, DAY DESC

来源

2015-12-02 11:21:03

如何获得最大列使用SQL？

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