摘要: 1.SQL执行顺序: select 考生姓名, max(总成绩) as max总成绩 from tb_Grade where 考生姓名 is not null group by 考生姓名 having max(总成绩) > 600 order by max总成绩 (1). 首先执行 FROM 子句, 阅读全文
posted @ 2020-12-29 12:21 暖暖-木木 阅读(135) 评论(0) 推荐(0) 编辑