在where子句中使用臨時表時遇到問題

Question

我正在創建一個報告，用戶可以在兩個狀態字段之間進行選擇。默認Completed狀態和Any。如果選擇的狀態不是Completed，那麼它需要忽略或選擇所有值。我創建了一個包含所有不同值的臨時表，並將其設置爲局部變量。我試圖在我的where子句中使用case statement和這個臨時表來處理這個問題，但它不會讓我。除了將sql設置爲字符串和exec'ing之外，還有更好的方法來處理嗎？

Declare @paramCompleted varchar(20) = 'Completed' 
Declare @paramCommitmentExamined varchar(20) = 'Requested' 
Declare @paramDateFrom Date 
Declare @paramDateTo Date 

Declare @PurchStatus as table([status] varchar(15)) 
insert into @PurchStatus([status]) select DISTINCT TX01STAT from dimFile_T order by TX01STAT 
--select * from @PurchStatus 
SELECT 
    dbo.ParseDate(O.ORDDATE) AS ORDDATE, 
    T.TX04STAT,--Commitment Examined & type 
    E.EXAMINER, 
    T.TX02STAT,--Outside search 
    C.COUNTY, 
    S.SETTSTAT, 
    CASE 
     WHEN L.LOANAMT = 0 THEN 'Cash' 
     ELSE CAST(L.LOANAMT AS VARCHAR(10)) 
    END AS LOANAMT, 
    T.TX01STAT,--Purchase agreement received 
    M.MKTSOURC, 
    CASE 
     WHEN C.FIRMFILE LIKE '%PC%' THEN 'Commercial' 
     WHEN C.FIRMFILE LIKE '%RC%' THEN 'Commercial' 
     ELSE 'Residential' 
    END AS FIRMFILE, 
    C.FIRMFILE as FILENUM, 
    'Metes & Bounds' AS LOTUNIT, 
    S.STATCMT 
FROM 
    dimFile_O O 
    LEFT JOIN dimfile_T T ON T.FIRMFILE = O.FIRMFILE 
    LEFT JOIN dimfile_E E ON E.FIRMFILE = O.FIRMFILE 
    LEFT JOIN dimfile_C C ON C.FIRMFILE = O.FIRMFILE 
    LEFT JOIN dimfile_S S ON S.FIRMFILE = O.FIRMFILE 
    LEFT JOIN dimfile_L L ON L.FIRMFILE = O.FIRMFILE 
    LEFT JOIN dimfile_M M ON M.FIRMFILE = O.FIRMFILE 
    LEFT JOIN dimfile_P P ON P.FIRMFILE = O.FIRMFILE 
WHERE 
    T.TX04STAT IN (@paramCommitmentExamined) 
    AND T.TX01STAT IN (
     CASE 
      WHEN @paramCompleted = 'Completed' THEN @paramCompleted 
      ELSE @PurchStatus 
     END) 

Answer 1

您需要一個select。但是，我認爲in也可以改進：

WHERE T.TX04STAT = @paramCommitmentExamined AND 
     ((@paramCompleted = 'Completed' AND T.TX01STAT = @paramCompleted) OR 
     (coalesce(@paramCompleted, '') <> 'Completed' AND T.TX01STAT IN (SELECT status FROM @PurchStatus)) 
    ) 

不要用字符串變量使用in。你會開始認爲in ('Completed,Requested')檢查兩個值而不是一個值。