如何输出

Question

我试图更改保存的值的名称，当我执行我的SQL脚本过程中更改数值名称：

SELECT 
    PERSONNUM, 
    PAYCODENAME, 
    CAST(WFCTIMEINSECONDS AS FLOAT)/3600 AS Total_Hours 
FROM 
    VP_ALLTOTALS 
WHERE 
    Applydate >= '09/25/2011' AND 
    Applydate <= '10/01/2011' AND 
    PAYCODENAME IN ('Vacation' 
        ,'Sick Leave - Paid' 
        ,'Personal Business - Paid' 
        ,'Comp Time - Paid' 
        ) 

我希望假期是VAC，病假 - 付费是SIC，个人业务 - 已付费PER和

Answer 1

最简单的方法是CASE替代选项列表。

SELECT PERSONNUM 
     PAYCODENAME CASE WHEN 'Vacation' THEN 'VAC' 
         WHEN 'Sick Leave - Paid' THEN 'SIC' 
         WHEN 'Personal Business - Paid' THEN 'PER' 
         ELSE PAYCODENAME END AS PAYCODENAME 
     .... 

Answer 2

使用CASE声明：

SELECT 
    PERSONNUM, 
    CASE PAYCODENAME 
    WHEN 'VACATION' THEN 'Vac' 
    WHEN 'Sick Leave - Paid' THEN 'SIC' 
    WHEN 'Comp Time - Paid' THEN 'PER' 
    ELSE PAYCODENAME 
    END, 
    cast(WFCTIMEINSECONDS as float)/3600 as Total_Hours 
FROM 
    VP_ALLTOTALS 
WHERE 
    Applydate >= '09/25/2011' AND 
    Applydate <= '10/01/2011' AND 
    PAYCODENAME in ('Vacation' 
    ,Sick Leave - Paid' 
    ,'Personal Business - Paid' 
    ,'Comp Time - Paid' 
    ) 

Answer 3

可以代替使用永久表，派生表，或公共表表达式（须在RDBMS中的可用性）与映射，并加入到该in列表。

WITH PAYCODES(PAYCODENAME, LABEL) 
    AS (SELECT 'Vacation', 
       'VAC' 
     UNION ALL 
     SELECT 'Sick Leave - Paid', 
       'SIC' 
     UNION ALL 
     SELECT 'Personal Business - Paid', 
       'PER' 
     UNION ALL 
     SELECT 'Comp Time - Paid', 
       '') 
SELECT PERSONNUM, 
     LABEL AS PAYCODENAME, 
     CAST(WFCTIMEINSECONDS AS FLOAT)/3600 AS Total_Hours 
FROM VP_ALLTOTALS 
     JOIN PAYCODES 
     ON PAYCODES.PAYCODENAME = VP_ALLTOTALS.PAYCODENAME 
WHERE Applydate >= '09/25/2011' 
     AND Applydate <= '10/01/2011'