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

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