如何使用通配符参数和其他参数来过滤数据？

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 的首字母并过滤结果，或者如果用户将其留空，则忽略它参数：

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

但我很难让它与 @IsMatch 参数一起工作：

如果我在 @Rater_PolicyNumber 中传递值，则以下内容有效，但如果我将其留空 - 它 return 包含所有记录，而不仅仅是不匹配的记录。

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

我如何才能 return 'No Match'、'Match' 和 'Both' 记录并仅在用户输入时按 @Rater_PolicyNumber 值过滤它们。

谢谢

Answer 1

使用多个 and 和 or 可能会很棘手。我已经应用了一些格式并在这些部分周围添加了括号 return 记录，因为它们最初被 returned，但是如果 @Rater_PolicyNumber 不为空，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

你能试试这个吗？

        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来过滤数据？

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