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选择课程-成都朗沃软件培训
热门文章-成都朗沃软件培训
教你快速掌握"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。
原载：朗沃IT教育 成都中心 lovoinfo.com
版权所有，转载时必须以链接形式注明作者和原始出处及本声明
