题
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 中的第一个和第二个 case 语句中获得结果。但是 WhrStr 中传入的值是“e.SpecializationId 为 null 或 e.SpecializationId 不为 null”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。
解决方案
if (isnull(@Prm_CourseId, 0) = 0 or isnull(@Prm_CourseID, 0) = -1)
set @Prm_CourseId = null
if (isnull(@Prm_SpecializationId, 0) = 0 or isnull(@Prm_SpecializationId, 0) = -1)
set @Prm_SpecializationId = null
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 (@Prm_CourseId is null or e.CourseId = @Prm_CourseId)
or (@Prm_SpecializationId is null or e.SpecializationId = @Prm_SpecializationId)
其他提示
这在几个层面上都行不通。
- 您无法将字符串附加到查询中。它要么全部是动态的,要么全部不是。
CASE WHEN 位需要位于字符串分隔符中“
...THEN '(e.CourseId is null or e.CourseId is not null)'...
“e.CourseId 为空或 e.CourseId 不为空”是相同的“总是给我数据”
所有你需要的是:
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
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