几句常用而又简单的SQL语句

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 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


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 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


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(a.telfeedate, 'mm'), '02',
a.factration)) AS FRI,


SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '03',
a.factration)) AS MAR,


SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '04',
a.factration)) AS APR,


SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '05',
a.factration)) AS MAY,


SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '06',
a.factration)) AS JUE,


SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '07',
a.factration)) AS JUL,


SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '08',
a.factration)) AS AGU,


SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '09',
a.factration)) AS SEP,


SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '10',
a.factration)) AS OCT,


SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '11',
a.factration)) AS NOV,


SUM(decode(TO_CHAR(a.telfeedate, 'mm'), '12',
a.factration)) AS DEC


FROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate,
b.factration


FROM TELFEESTAND a, TELFEE b


WHERE a.tel = b.telfax) a


GROUP BY a.userper, a.tel, a.standfee,
TO_CHAR(a.telfeedate, 'yyyy')


说明：四表联查问题：


SQL: select * from a left inner join b on a.a=b.b right
inner join c on a.a=c.c inner join d on a.a=d.d where
.....


说明：得到表中最小的未使用的ID号


SQL:


SELECT (CASE WHEN EXISTS(SELECT * FROM Handle b WHERE
b.HandleID = 1) THEN MIN(HandleID) + 1 ELSE 1 END) as
HandleID


FROM Handle


WHERE NOT HandleID IN (SELECT a.HandleID - 1 FROM Handle
a)