我有以下查询。我需要将Description设置为中间的long语句的值 - 以CONVERT开头并以[Description]结尾的部分。我现在运行的查询但结果中Description的值始终为NULL。有什么想法吗？
select s.SectionId,
s.Academic_Year [AcademicYear],
s.Academic_Term [AcademicTerm],
s.Academic_Session [AcademicSession],
s.Event_Id [EventId],
s.Event_Sub_Type [EventSubType],
s.Section [Section],
s.Event_Long_Name [EventLongName],
e.Description [EventDescription],
CONVERT(varchar(MAX), S.DESCRIPTION)
+ '<br /><br /><a href="http://www.bkstr.com/webapp/wcs/stores/servlet/booklookServlet?bookstore_id-1=044&term_id-1='
+ CASE S.ACADEMIC_TERM
WHEN 'SPRING' THEN 'SPRING'
WHEN 'SUMMER' THEN 'SUM'
WHEN 'FALL' THEN 'FALL'
WHEN 'J TERM' THEN 'J TERM'
ELSE 'ADV'
END
+ S.ACADEMIC_YEAR + '/' +
CASE S.ACADEMIC_SESSION
WHEN '01' THEN '1'
WHEN '02' THEN '2'
WHEN '03' THEN '3'
END
+ '&div-1=HILB&dept-1=' + SUBSTRING(S.EVENT_ID, 1, CHARINDEX(' ', S.EVENT_ID) - 1) + '&course-1=' + SUBSTRING(S.EVENT_ID, CHARINDEX(' ', S.EVENT_ID) + 1,
LEN(S.EVENT_ID)) + '§ion-1=' + CONVERT(varchar(2), S.SECTION) + '" target=' + '"_blank">View Book Information</a>' [Description],
cest.Medium_Desc [SubTypeDescription],
s.Credits [Credits],
cge.Medium_Desc [GeneralEd],
s.Start_Date [StartDate],
s.End_Date [EndDate],
s.Max_Participant [MaximumParticipants],
s.Adds [AddCount],
s.Wait_List [WaitlistCount],
s.Sec_Enroll_Status [EnrollmentStatus],
o.Org_Name_1 [CampusName],
cp.Medium_Desc [ProgramDescription],
cc.Medium_Desc [CollegeDescription],
cd.Medium_Desc [DepartmentDescription],
ccm.Medium_Desc [CurriculumDescription],
ccl.Medium_Desc [ClassLevelDescription],
nt.Nontrad_Med_Name [NonTraditionalDescription],
cpn.Medium_Desc [PopulationDescription],
case s.Other_Org when 'N' then 0 else s.Other_Org_Part end as [CampusOtherLimit],
case s.Other_Program when 'N' then 0 else s.Other_Program_Part end as [ProgramOtherLimit],
case s.Other_College when 'N' then 0 else s.Other_College_Part end as [CollegeOtherLimit],
case s.Other_Department when 'N' then 0 else s.Other_Dept_Part end as [DepartmentOtherLimit],
case s.Other_Curriculum when 'N' then 0 else s.Other_Curric_Part end as [CurriculumOtherLimit],
case s.Other_Class_Level when 'N' then 0 else s.Other_CLevel_Part end as [ClassLevelOtherLimit],
case s.Other_NonTrad when 'N' then 0 else s.Other_NonTrad_Part end as [NonTraditionalOtherLimit],
case s.Other_Population when 'N' then 0 else s.Other_Pop_Part end as [PopulationOtherLimit],
s.Other_Org_Add as [CampusOtherRegistered],
s.Other_Program_Add as [ProgramOtherRegistered],
s.Other_College_Add as [CollegeOtherRegistered],
s.Other_Dept_Add as [DepartmentOtherRegistered],
s.Other_Curr_Add as [CurriculumOtherRegistered],
s.Other_CLevel_Add as [ClassLevelOtherRegistered],
s.Other_Nontrad_Add as [NonTraditionalOtherRegistered],
s.Other_Pop_Add as [PopulationOtherRegistered],
case s.Registration_Type when 'TRAD' then 0 else 1 end as [IsConEd],
cat.Medium_Desc [TermDescription],
cas.Medium_Desc [SessionDescription],
s.Credit_Type [DefaultCreditType],
cct.Medium_Desc [CreditTypeDescription]
from sections s
left join code_eventsubtype cest on cest.code_value_key = s.event_sub_type
left join code_generaled cge on cge.code_value_key = s.general_ed
left join event e on e.event_id = s.event_id
left join organization o on o.org_code_id = s.org_code_id
left join code_program cp on cp.code_value_key = s.program
left join code_college cc on cc.code_value_key = s.college
left join code_department cd on cd.code_value_key = s.department
left join code_curriculum ccm on ccm.code_value_key = s.curriculum
left join code_classlevel ccl on ccl.code_value_key = s.class_level
left join nontraditional nt on nt.nontrad_program = s.nontrad_program
left join code_population cpn on cpn.code_value_key = s.population
left join code_acaterm cat on cat.code_value_key = s.academic_term
left join code_acasession cas on cas.code_value_key = s.academic_session
left join code_acacredittype cct on cct.code_value_key = s.credit_type