| 标题 | 快速掌握一些异常精妙的sql语句 |
| 范文 | 精妙地sql语句: ◆复制表(只复制结构,源表名：a 新表名：b) sql: select * into b from a where 1<>1 ◆拷贝表(拷贝数据,源表名：a 目标表名：b) sql: insert into b(a, b, c) select d,e,f from b; ◆显示文章、提交人和最后回复时间 sql: select a.title,a.username,b.adddate from table a, (select max(adddate) adddate from table where table.title=a.title) b ◆说明：外连接查询(表名1：a 表名2：b) sql: select a.a, a.b, a.c, b.c, b.d, b.f from a left out join b on a.a = b.c ◆日程安排提前五分钟提醒 sql: select * from 日程安排 where datediff('minute',f开始时间,getdate())>5 ◆两张关联表，删除主表中已经在副表中没有地信息 sql: delete from info where not exists ( select * from infobz where info.infid=infobz.infid ) ◆说明： sql: select a.num, a.name, b.upd_date, b.prev_upd_date from table1,(select x.num, x.upd_date, y.upd_date prev_upd_date from (select num, upd_date, inbound_qty, stock_onhand from table2 where to_char(upd_date, 'yyyy/mm') = to_char(sysdate, 'yyyy/mm')) x, (select num, upd_date, stock_onhand from table2 where to_char(upd_date,'yyyy/mm') = to_char(to_date (to_char(sysdate, 'yyyy/mm') ¦¦ '/01',' yyyy/mm/dd') - 1, 'yyyy/mm') ) y, where x.num = y.num （+）and x.inbound_qty + nvl(y.stock_onhand,0) <> x.stock_onhand ) b where a.num = b.num ◆说明： sql: select * from studentinfo where not exists(select * from student where studentinfo.id=student.id) and 系名称='&strdepartmentname&' and 专业名称 ='&strprofessionname&' order by 性别,生源地,高考总成绩 |
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