Database Num_rows()?

Hi all,

Stupid Question here: 
Is there a function to return num rows like there was in CI 3? or is it a case of having to run a SQL COUNT field in my queries? 
Am fine doing that, but just find it more convenient to have a num rows function or field already available. I have looked through the Database reference pages but did;t see it, unless I overlooked it somewhere.

BTW, am expecting some stupid, some know-it-all, even some answers that completely miss the question. But don't I won't take offence.