2021年8月6日
group by grouping sets 的用法
摘要： SELECT country, null department, round(avg(salary), 2) FROM employee1 GROUP BY country UNION ALL SELECT null country, department, round(avg(salary), 2 阅读全文
posted @ 2021-08-06 14:28 大熊童鞋 阅读(675) 评论(0) 推荐(0) 编辑