I'm not sure about using parentheses, I've been told by Microsoft support that they can affect how code works.

Some years ago, I had a problem with Foxpro 2.5 and an SQL select returning unexpected results, after several calls, one support engineer asked to see a copy of the code, which was in the form :

select ..... where (a=b) AND (c=d) AND (e=f)

he asked me why the parentheses were there - so I told him to aid readability - & in all seriousness he told me that they weren't necessary & if I removed them then the select would work correctly.

(At that point, I was actually desperate enough to try & of course it didn't work. Since then I've been very dubious about the quality of MS tech support.)