[导读] 精妙的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 1a8093152e673feb7aba1828c435320941 ◆拷贝表(拷贝数据,源表名：a 目标表名：b) sql: insert into b(a, b, c) se
精妙的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的信息
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
以上就是 快速掌握一些异常精妙的sql语句的内容。