Question

我目前有一条select语句，它会根据条件而变化：

if @LoadUsage = '|CreateBatch|'
                        begin
                            -- Do lookup on ClaimNumber and InterchangeName provided
                            -- Use @version scalar to filter latest InputAdjustmentVersion
                            select @ClaimSubmissionNumber = CS.ClaimSubmissionNumber 
                            from ClaimSubmissions CS inner join Claims C on C.ClaimID = CS.ClaimID
                                               inner join InterchangeInfo I on CS.InterchangeId = I.InterchangeId
                            where I.InterchangeName = @InterchangeName
                                and C.ClaimNumber = @ClaimNumber
                                and CS.SubmissionStatus in (select SubmissionStatus from @AllowedSubmissionStatus)
                                and Cs.InputAdjustmentVersion = @Version
                        end
                    else
                        begin
                            -- Do lookup on ClaimNumber and InterchangeName provided
                            select @ClaimSubmissionNumber = CS.ClaimSubmissionNumber 
                            from ClaimSubmissions CS inner join Claims C on C.ClaimID = CS.ClaimID
                                inner join InterchangeInfo I on CS.InterchangeId = I.InterchangeId
                            where I.InterchangeName = @InterchangeName
                                and C.ClaimNumber = @ClaimNumber
                                and CS.SubmissionStatus in (select SubmissionStatus from @AllowedSubmissionStatus)
                        end

如果@LoadUsage标量为'|CREATEBATCH|'，则向where子句添加另一个检查（and Cs.InputAdjustmentVersion = @Version）。有没有办法用where子句中的case语句来代替两个不同的select语句呢？

Answer 1

只需使用OR：

select @ClaimSubmissionNumber = CS.ClaimSubmissionNumber 
from ClaimSubmissions CS inner join Claims C on C.ClaimID = CS.ClaimID
                   inner join InterchangeInfo I on CS.InterchangeId = I.InterchangeId
where I.InterchangeName = @InterchangeName
    and C.ClaimNumber = @ClaimNumber
    and CS.SubmissionStatus in (select SubmissionStatus from @AllowedSubmissionStatus)
    and (@LoadUsage <> '|CreateBatch|' or Cs.InputAdjustmentVersion = @Version)

Answer 2

是的，您应该能够添加@LoadUsage ='| CreateBatch |'到WHERE，并根据true或false确定适当的逻辑。例如

WHERE @LoadUsage = '|CreateBatch|' AND (..logic 1....) 
         OR  @LoadUsage <> '|CreateBatch|' AND (...logic 2...)

根据条件的条款

2 个答案: