AND and OR may be intermixed
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/*
mysql> select * from Bird; +----------+-------+---------+------+------------+-------+ | name | owner | species | sex | birth | death | +----------+-------+---------+------+------------+-------+ | BlueBird | Joe | Car | f | 1999-03-30 | NULL | | RedBird | Yin | Bus | m | 1979-03-30 | NULL | +----------+-------+---------+------+------------+-------+ 2 rows in set (0.00 sec)
mysql> /*although AND has higher precedence than OR*/ mysql> SELECT * FROM Bird WHERE (species = 'Car' AND sex = 'm') -> OR (species = 'Bus' AND sex = 'f'); Empty set (0.00 sec)
*/ Drop table Bird;
CREATE TABLE Bird ( name VARCHAR(20), owner VARCHAR(20), species VARCHAR(20), sex CHAR(1), birth DATE, death DATE ); INSERT INTO Bird VALUES ('BlueBird','Joe','Car','f','1999-03-30',NULL); INSERT INTO Bird VALUES ('RedBird','Yin','Bus','m','1979-03-30',NULL); select * from Bird; /*although AND has higher precedence than OR*/ SELECT * FROM Bird WHERE (species = 'Car' AND sex = 'm') OR (species = 'Bus' AND sex = 'f');
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