如何在几列的最大值中每行返回1个值:
的表
[Number, Date1, Date2, Date3, Cost]
我需要返回这样的东西:
[Number, Most_Recent_Date, Cost]
查询?
如何在几列的最大值中每行返回1个值:
的表
[Number, Date1, Date2, Date3, Cost]
我需要返回这样的东西:
[Number, Most_Recent_Date, Cost]
查询?
当前回答
另一种使用CASE WHEN的方法
SELECT CASE true
WHEN max(row1) >= max(row2) THEN CASE true WHEN max(row1) >= max(row3) THEN max(row1) ELSE max(row3) end ELSE
CASE true WHEN max(row2) >= max(row3) THEN max(row2) ELSE max(row3) END END
FROM yourTable
其他回答
这是一个古老的答案,在很多方面都有问题。
请参阅https://stackoverflow.com/a/6871572/194653,它有更多的赞,与sql server 2008+一起工作,并处理空值等。
原创但有问题的答案:
你可以使用CASE语句:
SELECT
CASE
WHEN Date1 >= Date2 AND Date1 >= Date3 THEN Date1
WHEN Date2 >= Date1 AND Date2 >= Date3 THEN Date2
WHEN Date3 >= Date1 AND Date3 >= Date2 THEN Date3
ELSE Date1
END AS MostRecentDate
下面是使用T-SQL和SQL Server实现Max功能的另一个很好的解决方案
SELECT [Other Fields],
(SELECT Max(v)
FROM (VALUES (date1), (date2), (date3),...) AS value(v)) as [MaxDate]
FROM [YourTableName]
Values是表值构造函数。
"指定要构造到表中的一组行值表达式。Transact-SQL表值构造函数允许在单个DML语句中指定多行数据。表值构造函数可以指定为INSERT…VALUES语句,或者作为MERGE语句的USING子句或FROM子句中的派生表。
上表为员工工资表,列为salary1、salary2、salary3、salary4。下面的查询将返回四列中的最大值
select
(select Max(salval) from( values (max(salary1)),(max(salary2)),(max(salary3)),(max(Salary4)))alias(salval)) as largest_val
from EmployeeSalary
运行上述查询将输出largest_val(10001)
上述查询逻辑如下:
select Max(salvalue) from(values (10001),(5098),(6070),(7500))alias(salvalue)
输出将是10001
Scalar Function cause all sorts of performance issues, so its better to wrap the logic into an Inline Table Valued Function if possible. This is the function I used to replace some User Defined Functions which selected the Min/Max dates from a list of upto ten dates. When tested on my dataset of 1 Million rows the Scalar Function took over 15 minutes before I killed the query the Inline TVF took 1 minute which is the same amount of time as selecting the resultset into a temporary table. To use this call the function from either a subquery in the the SELECT or a CROSS APPLY.
CREATE FUNCTION dbo.Get_Min_Max_Date
(
@Date1 datetime,
@Date2 datetime,
@Date3 datetime,
@Date4 datetime,
@Date5 datetime,
@Date6 datetime,
@Date7 datetime,
@Date8 datetime,
@Date9 datetime,
@Date10 datetime
)
RETURNS TABLE
AS
RETURN
(
SELECT Max(DateValue) Max_Date,
Min(DateValue) Min_Date
FROM (
VALUES (@Date1),
(@Date2),
(@Date3),
(@Date4),
(@Date5),
(@Date6),
(@Date7),
(@Date8),
(@Date9),
(@Date10)
) AS Dates(DateValue)
)
问题:选择给定实体的最小速率值 要求:代理费率可以为空
[MinRateValue] =
CASE
WHEN ISNULL(FitchRating.RatingValue, 100) < = ISNULL(MoodyRating.RatingValue, 99)
AND ISNULL(FitchRating.RatingValue, 100) < = ISNULL(StandardPoorsRating.RatingValue, 99)
THEN FitchgAgency.RatingAgencyName
WHEN ISNULL(MoodyRating.RatingValue, 100) < = ISNULL(StandardPoorsRating.RatingValue , 99)
THEN MoodyAgency.RatingAgencyName
ELSE ISNULL(StandardPoorsRating.RatingValue, 'N/A')
END
受到Nat回答的启发