select TOP (all)

Question

declare @t int
set @t = 10
if (o = \'mmm\') set @t = -1
select top(@t) * from table

What if I want generally it resulted with 10 rows, but rarely a

Answer 1

im not sure I understand your question.

But if you sometimes want TOP and other times don't just use if / else construct:

if (condition)
  'send TOP
  SELECT TOP 10 Blah FROM...
else
  SELECT blah1, blah2 FROM...