PL/SQL check if query returns empty

Question

I\'m writing a procedure, and i need to check whether my select query returned an empty record or not. (In this example whether there is no x,y shelf)

How can i do t

Answer 1

Exception handling would be the first thing I think of too, but if you don't want to burden yourself with handling all the different cases, I tend to use a select count(*) from. The nice thing with count(*) is that it ALWAYS returns something (assuming your query is legal). In this case you could count to see if it returns 0 (no matches) or more (in which case you can do something.

You could get something like this:

declare
  v_count number := 0;
begin
  select count(*) into v_count from table where condition;

  if v_count = 0 then
      --do something
  else
      --do something else
  end if;
end;