Interesting question and just so happened to have read about this last week!
That's why I always use parenthesis
They also make queries easier to read
Especially with +, -, *, /, ... equations
I was taught to use parenthesis not only for the compiler but also for the maintainer. Consistently not using parenthesis and relying on precedence leaves an ambiguity whereas someone who consistently uses them is also clear in their intent if they omit them.
-- Stop your grinnin' and drop your linen...they're everywhere!!!
In my experience many developers and dbas are unaware of operator precedence for other than arithmetic or boolean operations - perhaps because they pay only lip service to set-oriented thinking. So it's nice to see a queston on precedence for set-oriented operators.