在where子句中使用临时表时遇到问题

Question

我正在创建一个报告，用户可以在两个状态字段之间进行选择。默认Completed状态和Any。如果选择的状态不是Completed，那么它需要忽略或选择所有值。我创建了一个包含所有不同值的临时表，并将其设置为局部变量。我试图在我的where子句中使用case statement和这个临时表来处理这个问题，但它不会让我。除了将sql设置为字符串和exec'ing之外，还有更好的方法来处理吗？

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

您需要一个select。但是，我认为in也可以改进：

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

不要用字符串变量使用in。你会开始认为in ('Completed,Requested')检查两个值而不是一个值。