AND has higher precedence than OR:
From Oracle 12.1 docs (precedence for AND and OR is consistent to at least version 7 - probably further but I don't have documentation links)
Prior versions:
Operator precedences are shown in the following list, from highest
precedence to the lowest. Operators that are shown together on a line
have the same precedence.
INTERVAL
BINARY, COLLATE
!
- (unary minus), ~ (unary bit inversion)
^
*, /, DIV, %, MOD
-, +
<<, >>
&
|
= (comparison), <=>, >=, >, <=, <, <>, !=, IS, LIKE, REGEXP, IN
BETWEEN, CASE, WHEN, THEN, ELSE
NOT
&&, AND
XOR
||, OR
= (assignment), :=
However I would HIGHLY encourage the use of parentheses both for clarity and to ENSURE that the operators are evaluated in the order that you intend.
