SQL应用参数而不是硬编码

Question

我需要一点帮助，我有一个报告，我正在运行，只根据硬编码的许多'类别'提取某些信息。但是，我希望尽可能灵活，并且我想用可以由用户选择的参数替换这些编码类别。但是，当我尝试这个时，它从来不会出于各种原因。当前的代码是：

SELECT   gcs_allocatedpdaidname AS PDA, 
     gcs_consideringapplyingyearname AS 'Intending to Start ITT', 
     SUM(CASE WHEN (gcs_allocatedpdaid IS NOT NULL) AND (gcs_ContactType = 1) THEN 1 ELSE 0 END) AS 'Total Participants', 
     SUM(CASE WHEN (gcs_allocatedpdaid IS NOT NULL) AND (gcs_ContactType = 1) AND (StatusCode = 1) THEN 1 ELSE 0 END) AS 'Active Participants', 
     SUM(CASE WHEN (gcs_allocatedpdaid IS NOT NULL) AND (gcs_ContactType = 1) AND (StatusCode = 200001) THEN 1 ELSE 0 END) AS 'Completed Participants', 
     SUM(CASE WHEN (gcs_allocatedpdaid IS NOT NULL) AND (gcs_ContactType = 1) AND ((gcs_categoryofparticipant = 7) OR 
          (gcs_categoryofparticipant = 8) OR 
          (gcs_categoryofparticipant = 9) OR 
          (gcs_categoryofparticipant = 10) OR 
          (gcs_categoryofparticipant = 11) OR 
          (gcs_categoryofparticipant = 12)) THEN 1 ELSE 0 END) AS 'On ITT and beyond TOTAL', 

     SUM(CASE WHEN (gcs_allocatedpdaid IS NOT NULL) AND (gcs_ContactType = 1) AND ((StatusCode = 1) OR (StatusCode = 200001)) THEN 1 ELSE 0 END) AS 'On ITT and beyond ACTIVE/COMPLETE' 

FROM   FilteredContact 
GROUP BY gcs_allocatedpdaidname, gcs_allocatedpdaid, gcs_consideringapplyingyearname 
HAVING  (gcs_allocatedpdaidname IN (@PDA)) AND (gcs_consideringapplyingyearname IN (@ITTYear)) 
ORDER BY PDA, 'Intending to Start ITT' 

硬编码我想要替换的是“gcs_categoryofparticipant”，见下图：

SUM(CASE WHEN (gcs_allocatedpdaid IS NOT NULL) AND (gcs_ContactType = 1) AND 
           ((gcs_categoryofparticipant = 7) OR 
           (gcs_categoryofparticipant = 8) OR 
           (gcs_categoryofparticipant = 9) OR 
           (gcs_categoryofparticipant = 10) OR 
           (gcs_categoryofparticipant = 11) OR 
           (gcs_categoryofparticipant = 12)) THEN 1 ELSE 0 END) AS 'On ITT and beyond TOTAL' 

我想这将是沿着线的东西：

SUM(CASE WHEN (gcs_allocatedpdaid IS NOT NULL) AND (gcs_ContactType = 1) AND (HAVING (gcs_categoryofparticipant IN (@Category))) THEN 1 ELSE 0 END) AS 'On ITT and beyond TOTAL' 

这显然不工作，但如果有人能指出我在正确的方向，将不胜感激。

感谢

Answer 1

你不需要具有任何的总和，或在查询的结尾 - 在查询结束的HAVING可以改变一个WHERE，而SUM可以是：

SUM(CASE WHEN (gcs_allocatedpdaid IS NOT NULL) AND 
       (gcs_ContactType = 1) AND 
       (gcs_categoryofparticipant IN (@Category)) 
     THEN 1 
     ELSE 0 
    END) AS 'On ITT and beyond TOTAL'