1.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 11
2.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 a;
3.说明：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
4.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 OUTER JOIN b ON a.a = b.c
5.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
6.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 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
7.说明：
从数据库中去一年的各单位电话费统计(电话费定额贺电化肥清单两个表来源）
SQL:
SELECT a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, ‘yyyy’) AS telyear,
SUM(decode(TO_CHAR(a.telfeedate, ‘mm’), ‘01′, a.factration)) AS JAN,
SUM(decode(TO_CHAR
