如何在SQL中创建序数(即"1st""2nd"等)

Question

我最近在SSRS-2008标签中回答了这个问题,该标签要求将日期中的日期编号更改为序数(即"1st","2nd"而不是"1","2").该解决方案涉及VB.Net功能.我很好奇如何在SQL中执行此任务(特别是t-sql和SQL Server),或者是否有一些内置支持.

所以这是一个场景:假设你已经为1000名参赛者组织了一个足球赛,并将结果放在一个包含名称和地点(正常数字)列的表格中.您想要创建一个查询,该查询将显示用户的名称及其在序号中的位置.

Answer 1

这是一个适用于任何数字的可扩展解决方案.我认为其他人使用%100表示​​11,12,13,但我错了.

WITH CTE_Numbers
AS
(
    SELECT 1 num
    UNION ALL
    SELECT num + 1
    FROM CTE_Numbers
    WHERE num < 1000
)

SELECT  CAST(num AS VARCHAR(10))
        +
        CASE
            WHEN num % 100 IN (11,12,13) THEN 'th' --first checks for exception
            WHEN num % 10 = 1 THEN 'st'
            WHEN num % 10 = 2 THEN 'nd'
            WHEN num % 10 = 3 THEN 'rd'
            ELSE 'th' --works for num % 10 IN (4,5,6,7,8,9,0)
        END
FROM CTE_Numbers
OPTION (MAXRECURSION 0)

Answer 2

您可以像在应用程序层中一样轻松地在SQL中执行此操作:

DECLARE @myDate DATETIME = '2015-05-21';
DECLARE @day INT;
SELECT  @day = DAY(@myDate);
SELECT  CASE WHEN @day IN ( 11, 12, 13 ) THEN CAST(@day AS VARCHAR(10)) + 'th'
             WHEN @day % 10 = 1 THEN CAST(@day AS VARCHAR(10)) + 'st'
             WHEN @day % 10 = 2 THEN CAST(@day AS VARCHAR(10)) + 'nd'
             WHEN @day % 10 = 3 THEN CAST(@day AS VARCHAR(10)) + 'rd'
             ELSE CAST(@day AS VARCHAR(10)) + 'th'
        END

如有必要,您还可以将其置于标量函数中.

编辑

对于你的例子,它将是:

SELECT  Name ,
        CASE WHEN Place IN ( 11, 12, 13 )
             THEN CAST(Place AS VARCHAR(10)) + 'th'
             WHEN Place % 10 = 1 THEN CAST(Place AS VARCHAR(10)) + 'st'
             WHEN Place % 10 = 2 THEN CAST(Place AS VARCHAR(10)) + 'nd'
             WHEN Place % 10 = 3 THEN CAST(Place AS VARCHAR(10)) + 'rd'
             ELSE CAST(Place AS VARCHAR(10)) + 'th'
        END AS Place
FROM    FootRaceResults;