Question

ALTER PROCEDURE MyProcName 
    @IsMatch varchar(50)
AS
    SELECT
        IMS_PolicyNumber, Rater_PolicyNumber
    FROM
        tblPolicies 
    WHERE
        (@IsMatch = 'No Match' AND Rater_PolicyNumber <> IMS_PolicyNumber OR Rater_PolicyNumber IS NULL) -- returns No Match records
        OR (@IsMatch = 'Match' AND Rater_PolicyNumber = IMS_PolicyNumber) --Returns Matching Records
        OR (@IsMatch = 'Both') --Returns both: matching and no matching records

但是现在我想添加通配符参数@Rater_PolicyNumber，这样用户就可以只输入Rater_PolicyNumber的第一个字母并过滤结果，或者如果用户将其留空，则只需忽略此参数：

AND @Rater_PolicyNumber LIKE COALESCE('%'+ @Rater_PolicyNumber+'%','')

但我很难将其与@IsMatch参数一起使用：

如果我在@Rater_PolicyNumber中传递值，则下面有效，但如果我将其留空，则返回所有记录，而不是仅返回非匹配记录。

WHERE
    ((@IsMatch = 'No Match' AND Rater_PolicyNumber <> IMS_PolicyNumber OR Rater_PolicyNumber is null) 
     OR Rater_PolicyNumber LIKE COALESCE('%'+ @Rater_PolicyNumber+'%',''))

如果用户将输入“{No>”，“匹配”和“两者”记录，并且仅按@Rater_PolicyNumber值过滤它们，我该怎么回事。

由于

Answer 1

使用多个and和or可能会变得棘手。我在部分周围应用了一些格式并添加了括号，以便在最初返回时返回记录，但如果@Rater_PolicyNumber不为null，则它也会应用like。

select IMS_PolicyNumber
  , Rater_PolicyNumber
from tblPolicies 
where (
       Rater_PolicyNumber like '%'+ @Rater_PolicyNumber+'%'
       or Rater_PolicyNumber is null
       or @Rater_PolicyNumber is null 
      )
  and (
        (@IsMatch = 'No Match' 
         and (Rater_PolicyNumber<>IMS_PolicyNumber 
              or Rater_PolicyNumber is null) 
          )
      -- returns No Match records
       or (@IsMatch= 'Match' and Rater_PolicyNumber=IMS_PolicyNumber) 
      -- Returns Matching Records
       or (@IsMatch = 'Both') 
      --Returns both: matching and no matching records 
      )

Answer 2

你能试试吗？

        SELECT
            IMS_PolicyNumber, Rater_PolicyNumber
        FROM
            tblPolicies 
        WHERE CHARINDEX(@IsMatch,CASE WHEN  Rater_PolicyNumber = IMS_PolicyNumber THEN 'Match,Both' ELSE 'No MATCH,Both' END)>0

如何使用通配符参数和其他参数过滤数据？

2 个答案: