2016年12月20日
oracle sql
摘要： show user desc 'table' SELECT DISTINCT SELECT * FROM emp WHERE comm is NOT NULL; SELECT * FROM emp WHERE NOT (sal > 1500 AND comm is NOT NULL); NOT IN 阅读全文
posted @ 2016-12-20 11:26 ppqchina 阅读(103) 评论(0) 推荐(0)