SQL高手篇:精妙SQL语句介绍,SQL高手篇:精妙SQL语句介绍
说明: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
说明: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;
说明:显示文章、提交人和最后回复时间
SQL: select ,, from table a,(select max(adddate) adddate from table where ) 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
说明: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
说明: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 )
说明:--
SQL:
SELECT A.NUM, , , FROM TABLE1,(SELECTX.NUM, , 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 + NVL(,) < ) B WHERE A.NUM = B.NUM
说明:--
SQL:
select * from studentinfo where not exists(select * from student where ) and 系名称=""&strdepartmentname&"" and专业名称=""&strprofessionname&"" order by 性别,生源地,高考总成绩
说明: 从数据库中去一年的各单位电话费统
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