2020年12月28日
sql进阶：分组查询、子查询、连接查询
摘要： SELECT in_dpt, COUNT(in_dpt) AS emp_count -> FROM employee GROUP BY in_dpt; SELECT in_dpt, COUNT(in_dpt) AS emp_count FROM employee -> GROUP BY in_dpt 阅读全文
posted @ 2020-12-28 15:24 emma0804 阅读(112) 评论(0) 推荐(0) 编辑