SQL Server 2008中「WHERE」子句中的「CASE」語句

Question

我正在使用「WHERE」子句中包含「CASE」語句的查詢。但是SQL Server 2008在執行時會出現一些錯誤。任何人都可以請幫助我正確的查詢？下面是該查詢：

SELECT 
    tl.storenum 'Store #', 
    co.ccnum 'FuelFirst Card #', 
    co.dtentered 'Date Entered', 
    CASE st.reasonid 
     WHEN 1 THEN 'Active' 
    WHEN 2 THEN 'Not Active' 
    WHEN 0 THEN st.ccstatustypename 
    ELSE 'Unknown' 
    END 'Status', 
    CASE st.ccstatustypename 
     WHEN 'Active' THEN ' ' 
    WHEN 'Not Active' THEN ' ' 
    ELSE st.ccstatustypename 
    END 'Reason', 
    UPPER(REPLACE(REPLACE(co.personentered,'RT\\\\',''),'RACETRAC\\\\','')) 'Person Entered', 
    co.comments 'Comments or Notes' 
FROM 
    comments co 
    INNER JOIN cards cc ON co.ccnum=cc.ccnum 
    INNER JOIN customerinfo ci ON cc.customerinfoid=ci.customerinfoid 
    INNER JOIN ccstatustype st ON st.ccstatustypeid=cc.ccstatustypeid 
    INNER JOIN customerstatus cs ON cs.customerstatuscd=ci.customerstatuscd 
    INNER JOIN transactionlog tl ON tl.transactionlogid=co.transactionlogid 
    LEFT JOIN stores s ON s.StoreNum = tl.StoreNum 
WHERE 
    CASE LEN('TestPerson') 
     WHEN 0 THEN co.personentered = co.personentered 
    ELSE co.personentered LIKE '%TestPerson' 
    END 
    AND cc.ccnum = CASE LEN('TestFFNum') 
     WHEN 0 THEN cc.ccnum 
    ELSE 'TestFFNum' 
    END 
    AND CASE LEN('2011-01-09 11:56:29.327') 
     WHEN 0 THEN co.DTEntered = co.DTEntered 
    ELSE 
     CASE LEN('2012-01-09 11:56:29.327') 
      WHEN 0 THEN co.DTEntered >= '2011-01-09 11:56:29.327' 
     ELSE co.DTEntered BETWEEN '2011-01-09 11:56:29.327' AND '2012-01-09 11:56:29.327' 
     END 
    END 
    AND tl.storenum < 699 
ORDER BY tl.StoreNum 

Answer 1

首先，在CASE語句必須表達部分，不表達自己。

換句話說，你可以有：

WHERE co.DTEntered = CASE 
          WHEN LEN('blah') = 0 
           THEN co.DTEntered 
          ELSE '2011-01-01' 
        END 

但它不會工作，你已經寫了他們的方式如：

WHERE 
    CASE LEN('TestPerson') 
     WHEN 0 THEN co.personentered = co.personentered 
    ELSE co.personentered LIKE '%TestPerson' 
    END 

您可以使用組合或之類的語句有更好的運氣這個：

WHERE (
     (LEN('TestPerson') = 0 
      AND co.personentered = co.personentered 
     ) 
     OR 
     (LEN('TestPerson') <> 0 
      AND co.personentered LIKE '%TestPerson') 
    ) 

雖然，無論哪種方式，我不知道你會得到多好的查詢計劃。 WHERE子句中的這些形式通常會阻止查詢優化器使用索引。

Answer 2

我認爲您的查詢的開頭應該看起來像：

SELECT 
    tl.storenum [Store #], 
    co.ccnum [FuelFirst Card #], 
    co.dtentered [Date Entered], 
    CASE st.reasonid 
     WHEN 1 THEN 'Active' 
     WHEN 2 THEN 'Not Active' 
     WHEN 0 THEN st.ccstatustypename 
     ELSE 'Unknown' 
    END [Status], 
    CASE st.ccstatustypename 
     WHEN 'Active' THEN ' ' 
     WHEN 'Not Active' THEN ' ' 
     ELSE st.ccstatustypename 
     END [Reason], 
    UPPER(REPLACE(REPLACE(co.personentered,'RT\\\\',''),'RACETRAC\\\\','')) [Person Entered], 
    co.comments [Comments or Notes] 
FROM comments co 
    INNER JOIN cards cc ON co.ccnum=cc.ccnum 
    INNER JOIN customerinfo ci ON cc.customerinfoid=ci.customerinfoid 
    INNER JOIN ccstatustype st ON st.ccstatustypeid=cc.ccstatustypeid 
    INNER JOIN customerstatus cs ON cs.customerstatuscd=ci.customerstatuscd 
    INNER JOIN transactionlog tl ON tl.transactionlogid=co.transactionlogid 
    LEFT JOIN stores s ON s.StoreNum = tl.StoreNum 
WHERE 
    CASE 
     WHEN (LEN([TestPerson]) = 0 AND co.personentered = co.personentered) OR (LEN([TestPerson]) <> 0 AND co.personentered LIKE '%'+TestPerson) THEN 1 
     ELSE 0 
     END = 1 
    AND 

但

什麼是尾部完全無法理解

Answer 3

這應該解決您的問題的暫時但我必須提醒你，這不是一個好方法：

WHERE 
      CASE LEN('TestPerson') 
       WHEN 0 THEN 
         CASE WHEN co.personentered = co.personentered THEN 1 ELSE 0 END 
       ELSE 
         CASE WHEN co.personentered LIKE '%TestPerson' THEN 1 ELSE 0 END 
      END = 1 
     AND cc.ccnum = CASE LEN('TestFFNum') 
          WHEN 0 THEN cc.ccnum 
          ELSE 'TestFFNum' 
         END 
     AND CASE LEN('2011-01-09 11:56:29.327') 
       WHEN 0 THEN CASE WHEN co.DTEntered = co.DTEntered THEN 1 ELSE 0 END 
       ELSE 
        CASE LEN('2012-01-09 11:56:29.327') 
         WHEN 0 THEN 
          CASE WHEN co.DTEntered >= '2011-01-09 11:56:29.327' THEN 1 ELSE 0 END 
         ELSE 
          CASE WHEN co.DTEntered BETWEEN '2011-01-09 11:56:29.327' 
                 AND '2012-01-09 11:56:29.327' 
                THEN 1 ELSE 0 END 
        END 
      END = 1 
     AND tl.storenum < 699 

Answer 4

select TUM1.userid,TUM1.first_name + ' ' +TUM1.last_name as NAME,tum1.Business_Title,TUM1.manager_id,tum2.First_Name + ' ' + tum2.Last_Name as [MANAGER NAME],TUM1.project,TUM1.project_code,TUM1.rcc_code,TUM1.department,TCM.Company_Name, 
case 
when tum1.Gender_ID=1 then 'male' 
else 'female' 
end 'GENDER' 
,tum1.Band as BAND, 
case when tum1.Inactive=0 then 'STILL IN COMPANY' 
else 'LEFT COMPANY' 
end 'ACTIVE/INACTIVE' 
from tbl_user_master TUM1 
join tbl_Company_Master TCM on TCM.Company_Code=TUM1.Company_Code 
join tbl_User_Master TUM2 on TUM1.Manager_ID=TUM2.UserID 
where tum1.UserID in ('54545414') 

Answer 5

嘗試以下方法：以這種方式

select * From emp_master 
where emp_last_name= 
case emp_first_name 
when 'test' then 'test' 
when 'Mr name' then 'name' 
end 

Answer 6

SELECT * from TABLE 
       WHERE 1 = CASE when TABLE.col = 100 then 1 
        when TABLE.col = 200 then 2 else 3 END 
        and TABLE.col2 = 'myname'; 

使用。

Answer 7

有WHERE部分可以這樣寫：

WHERE 
(LEN('TestPerson') <> 0 OR co.personentered = co.personentered) AND 
(LEN('TestPerson') = 0 OR co.personentered LIKE '%TestPerson') AND 
(cc.ccnum = CASE LEN('TestFFNum') 
       WHEN 0 THEN cc.ccnum 
       ELSE 'TestFFNum' 
       END) AND 
(LEN('2011-01-09 11:56:29.327') <> 0 OR co.DTEntered = co.DTEntered) AND 
((LEN('2011-01-09 11:56:29.327') = 0 AND LEN('2012-01-09 11:56:29.327') <> 0) OR co.DTEntered >= '2011-01-09 11:56:29.327' ) AND 
((LEN('2011-01-09 11:56:29.327') = 0 AND LEN('2012-01-09 11:56:29.327') = 0) OR co.DTEntered BETWEEN '2011-01-09 11:56:29.327' AND '2012-01-09 11:56:29.327' ) AND 
tl.storenum < 699 

Answer 8

這裏是我的解決方案

AND CLI.PE_NOM Like '%' + ISNULL(@NomClient, CLI.PE_NOM) + '%' 

Regads 戴維

Answer 9

這工作

declare @v int=A 
select * from Table_Name where XYZ=202 
and 
dbkey=(case @v when A then 'Some Value 1' 
else 'Some Value 2' 
end)