一些暴强的SQL语句

一些暴强的SQL语句
出处：	作者：	发布时间：2008-9-4
说明：复制表(只复制结构,源表名：a 新表名：b)   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) 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 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) 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 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 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：--   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 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）   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 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 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) 一个SQL语句的问题:行列转换 select * from v_temp 上面的视图结果如下: user_name role_name ------------------------- 系统管理员 管理员   feng 管理员   feng 一般用户   test 一般用户   想把结果变成这样: user_name role_name --------------------------- 系统管理员 管理员   feng 管理员,一般用户   test 一般用户 =================== create table a_test(name varchar(20),role2 varchar(20)) insert into a_test values('李','管理员') insert into a_test values('张','管理员') insert into a_test values('张','一般用户') insert into a_test values('常','一般用户') create function join_str(@content varchar(100)) returns varchar(2000) as begin declare @str varchar(2000) set @str='' select @str=@str+','+rtrim(role2) from a_test where [name]=@content select @str=right(@str,len(@str)-1) return @str end go --调用： select [name],dbo.join_str([name]) role2 from a_test group by [name] --select distinct name,dbo.uf_test(name) from a_test 快速比较结构相同的两表 结构相同的两表，一表有记录3万条左右，一表有记录2万条左右，我怎样快速查找两表的不同记录？ ============================ 给你一个测试方法，从northwind中的orders表取数据。 select * into n1 from orders select * into n2 from orders select * from n1 select * from n2 --添加主键，然后修改n1中若干字段的若干条 alter table n1 add constraint pk_n1_id primary key (OrderID) alter table n2 add constraint pk_n2_id primary key (OrderID) select orderID from (select * from n1 union select * from n2) a group by orderID having count(*) > 1 应该可以，而且将不同的记录的ID显示出来。 下面的适用于双方记录一样的情况， select * from n1 where orderid in (select orderID from (select * from n1 union select * from n2) a group by orderID having count(*) > 1)   至于双方互不存在的记录是比较好处理的 --删除n1,n2中若干条记录 delete from n1 where orderID in ('10728','10730') delete from n2 where orderID in ('11000','11001') --************************************************************* -- 双方都有该记录却不完全相同 select * from n1 where orderid in(select orderID from (select * from n1 union select * from n2) a group by orderID having count(*) > 1) union --n2中存在但在n1中不存的在10728,10730 select * from n1 where orderID not in (select orderID from n2) union --n1中存在但在n2中不存的在11000,11001 select * from n2 where orderID not in (select orderID from n1) 四种方法取表里n到m条纪录： 1. select top m * into 临时表(或表变量) from tablename order by columnname -- 将top m笔插入 set rowcount n select * from 表变量 order by columnname desc 2. select top n * from (select top m * from tablename order by columnname) a order by columnname desc 3.如果tablename里没有其他identity列，那么： select identity(int) id0,* into #temp from tablename 取n到m条的语句为： select * from #temp where id0 >=n and id0 <= m 如果你在执行select identity(int) id0,* into #temp from tablename这条语句的时候报错,那是因为你的DB中间的select into/bulkcopy属性没有打开要先执行： exec sp_dboption 你的DB名字,'select into/bulkcopy',true