if (select count(column) from table) > 0 then

Question

I need to check a condition. i.e:

if (condition)> 0 then
  update table
else do not update
end if

Do I need to store the result into a v

Answer 1

Edit:

The oracle tag was not on the question when this answer was offered, and apparently it doesn't work with oracle, but it does work with at least postgres and mysql

No, just use the value directly:

begin
  if (select count(*) from table) > 0 then
     update table
  end if;
end;

Note there is no need for an "else".

Edited

You can simply do it all within the update statement (ie no if construct):

update table
set ...
where ...
and exists (select 'x' from table where ...)