《Oracle Database编程指南》16-01:单列

封面:扫描上图二维码关注课程

内容导航


-------------------------------------------------------------------------------
--注意对比如下语句结果集;
SELECT JOB  FROM emp;
SELECT DISTINCT  JOB  FROM emp;

-------------------------------------------------------------------------------
--Sample1:分组和计数.计算每个职位的员工人数.
SE

猜你喜欢

转载自blog.csdn.net/goldentec/article/details/104877550