我有以下查询。
declare @Prm_CourseId int
declare @Prm_SpecializationId int
set @Prm_CourseId=5
set @Prm_SpecializationId=0
declare @WhrStr varchar(500)
set @WhrStr = case @Prm_CourseId
when 0 then
'e.CourseId is null or e.CourseId is not null'
when -1 then
'e.CourseId is null or e.CourseId is not null'
when isnull(@Prm_CourseId,0) then
'e.CourseId is null or e.CourseId is not null'
else
'e.CourseId= '+Convert(varchar,@Prm_CourseId)
end
set @WhrStr = case @Prm_SpecializationId
when 0 then
'e.SpecializationId is null or e.SpecializationId is not null'
when -1 then
'e.SpecializationId is null or e.SpecializationId is not null'
when isnull(@Prm_SpecializationId,0) then
'e.SpecializationId is null or e.SpecializationId is not null'
else
'e.SpecializationId= '+Convert(varchar,@ Prm_SpecializationId)
end
print @WhrStr
exec(
'select f.EnquiryID,
e.[Name],
f.AttendedBy,
f.Remarks,
f.CreatedDate
from STD_FollowUp f
inner join
STD_Enquiry e
on f.EnquiryId=e.EnquiryId
where'+' '+@WhrStr
)
这里的问题是我想在@WhrStr 中获得第一个和第二个 case 语句的结果。但是 WhrStr 中的值是'e.SpecializationId 为空或 e.SpecializationId 不为空'意味着第一个被第二个覆盖。无论如何将第二个附加到第一个。