select * from (<br />select * from jtrb1 where jtrb1.name='上衣' and jtrb1.price < 300 <br />union all<br />select * from jtrb2 where jtrb2.name='上衣' and jtrb2.price < 300 <br />union all <br />select * from jtrb3 where jtrb3.name='上衣' and jtrb3.price < 300<br />) as t<br />