SQL precedence will evaluate the AND's before the OR's. So unless there is
an OR condition embedded within a series of AND's the parenthesis are not
needed. I do agree that using parenthesis can make the intent clearer, but
will not change the result.
The clauses
a AND b OR c
(a AND b) OR c
are equivalent.
When a or b is a complex condition that also has OR then parenthesis are
probably needed.
In this case, it appears that the condition is an OR of two conditions that
consist entirely of AND conditions. If that is the case then parenthesis are
not required.
--
Mike Conley
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