[oracle] if (select count(column) from table) > 0 then

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 variable using select into?

e.g:

declare valucount integer
begin
  select count(column) into valuecount from table
end
if valuecount > o then
  update table
else do 
  not update

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 ...)

not so elegant but you dont need to declare any variable:

for k in (select max(1) from table where 1 = 1) loop
    update x where column = value;
end loop;