When I am creating a trigger for finding the grade of Student based on its AVG (SQL Server) - 


create trigger grade123 on student after insert begin     update student      set grade = case                    when avg > 75 'firstclass'                    when avg > 50 , avg < 75 'second class'                    when avg > 35 , avg < 60 'third class'                    else 'fail'                 end

i error:

msg 102, level 15, state 1, procedure grade123, line 11
incorrect syntax near 'end'

kindly me out

you have begin trigger, need add end. word avg reserved word need escape it. 

create trigger grade123 on student after insert begin     update student set grade =     case         when [avg] > 75 'first class'         when [avg] > 50 , [avg] <= 75 'second class'         when [avg] > 35 , [avg] < 60 'third class'         else 'fail'     end end

however @marc_s said trigger updating every row of table every time row inserted. should add lookup inserted special table available triggers shows records modified

assuming students looks like

create table students (     student_id int identity(1,1),     grade varchar(10),     [avg] int ) go

then

create trigger grade123 on students after insert begin     update students set grade =     case         when [avg] > 75 'first class'         when [avg] > 50 , [avg] <= 75 'second class'         when [avg] > 35 , [avg] < 60 'third class'         else 'fail'     end     student_id in (select student_id inserted) end

for loop if..else (although never use in production showing like)

set nocount on;  declare @students table (     ident int identity(1,1),     student_id int,     [avg] int )  insert @students (student_id, [avg]) select student_id, [avg] students  declare @table_count int = (select coalesce(count(ident),0) @students) declare @counter int = 1  declare @avg int  while (@table_count > 0 , @counter <= @table_count) begin     select @avg = [avg]     @students     ident = @counter      if (@avg > 75)         update students set              grade = 'first class'         student_id = @counter     else if (@avg > 50 , @avg <= 75)         update students set              grade = 'second class'         student_id = @counter     else if (@avg > 35 , @avg < 60)         update students set              grade = 'third class'         student_id = @counter     else         update students set              grade = 'fail'         student_id = @counter      set @counter += 1; end

Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer
Read more

c# - Asp.net web api : redirect unauthorized requst to forbidden page -

im trying redirect unauthorized request forbidden page instead i'm getting forbidden page in response body , how can fix ? here's startup class : app.createperowincontext(storecontext.create); app.createperowincontext<applicationusermanager>(applicationusermanager.create); app.createperowincontext<applicationsigninmanager>(applicationsigninmanager.create); app.usecookieauthentication(new cookieauthenticationoptions { authenticationtype = defaultauthenticationtypes.applicationcookie, expiretimespan = timespan.fromdays(30), }); app.useexternalsignincookie(defaultauthenticationtypes.externalcookie); app.usetwofactorsignincookie(defaultauthenticationtypes.twofactorcookie, timespan.fromminutes(5)); app.usetwofactorrememberbrowsercookie(defaultauthenticationtypes.twofactorrememberbrowsercookie); the method im trying reach : [httpget] [authorize(roles = "admin")] public string getcurrentusername() { return userman
Read more