SQL Trigger After Insert not Updating correctly -


i've inherited trigger use populate field based on related row. basically, sequence of 10, 20, 30 gets predecessor popluated 10, predecessor 0, 20, predecessor 10, etc. max(seq) seq < currentrowseq.

pretty straightforward, except when our sequence inserted, predecessors populating 0s. if piece out code , separately, numbers expect. figure must wrong in trigger firing. note trigger firing on child table insert. predecessor field in child ud table sequence in parent table. wonder if order in writes happening problem. i'm not sure. here's trigger: 

alter trigger [erp].[trgrjoboperudinsert] on [erp].[joboper_ud]  after insert    set nocount on  declare @jobnum varchar(100), @assemblyseq int, @oprseq int, @foreignsysrowid varchar(100), @pred varchar(100)  set @pred = ''  declare preds cursor local  select isnull(predecessor_c, ''), foreignsysrowid inserted  open preds  fetch next preds @pred, @foreignsysrowid while @@fetch_status = 0 begin  select @jobnum = jobnum, @assemblyseq = assemblyseq, @oprseq = oprseq joboper (nolock)  sysrowid = @foreignsysrowid  if @pred = '' or @pred = '0' begin  update erp.joboper_ud set predecessor_c = ( select isnull( max(oprseq) ,0) joboper  joboper.jobnum = @jobnum , joboper.assemblyseq = @assemblyseq , joboper.oprseq < @oprseq ) foreignsysrowid = @foreignsysrowid  end  fetch next preds @pred, @foreignsysrowid end close preds deallocate preds  set nocount off

the cursor added, exact same minus cursor before. i've played trigger in every way can think of achieve same result. breaks down @ update in predecessor_c = (select isnull(...)...). can put want isnull replacement , every time. why getting null inner select? said, if run select after fact result expect.


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