* 說(shuō)明：復(fù)制表(只復(fù)制結(jié)構(gòu),源表名：a 新表名：b) select * into b from a where 1<>1 * 說(shuō)明：拷貝表(拷貝數(shù)據(jù),源表名：a 目標(biāo)表名：b) insert into b(a, b, c) select d,e,f from b; * 說(shuō)明：顯示文章、提交人和最后回復(fù)時(shí)間 select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b * 說(shuō)明：外連接查詢(xún)(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 * 說(shuō)明：日程安排提前五分鐘提醒 select * from 日程安排 where datediff('minute',f開(kāi)始時(shí)間,getdate())>5 * 說(shuō)明：兩張關(guān)聯(lián)表，刪除主表中已經(jīng)在副表中沒(méi)有的信息 delete from info where not exists ( select * from infobz where info.infid=infobz.infid ) * 說(shuō)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 * 說(shuō)明：-- select * from studentinfo where not exists(select * from student where studentinfo.id=student.id) and 系名稱(chēng)='"&strdepartmentname&"' and 專(zhuān)業(yè)名稱(chēng)='"&strprofessionname&"' order by 性別,生源地,高考總成績(jī) * 從數(shù)據(jù)庫(kù)中去一年的各單位電話(huà)費(fèi)統(tǒng)計(jì)(電話(huà)費(fèi)定額賀電化肥清單兩個(gè)表來(lái)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') * 說(shuō)明：四表聯(lián)查問(wèn)題 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 ..... * 說(shuō)明：得到表中最小的未使用的ID號(hào) * 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) * 一個(gè)SQL語(yǔ)句的問(wèn)題:行列轉(zhuǎn)換 select * from v_temp 上面的視圖結(jié)果如下: user_name role_name ------------------------- 系統(tǒng)管理員 管理員 feng 管理員 feng 一般用戶(hù) test 一般用戶(hù) 想把結(jié)果變成這樣: user_name role_name --------------------------- 系統(tǒng)管理員 管理員 feng 管理員,一般用戶(hù) test 一般用戶(hù) =================== create table a_test(name varchar(20),role2 varchar(20)) insert into a_test values('李','管理員') insert into a_test values('張','管理員') insert into a_test values('張','一般用戶(hù)') insert into a_test values('常','一般用戶(hù)') 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 --調(diào)用： select [name],dbo.join_str([name]) role2 from a_test group by [name] --select distinct name,dbo.uf_test(name) from a_test
* 快速比較結(jié)構(gòu)相同的兩表 結(jié)構(gòu)相同的兩表，一表有記錄3萬(wàn)條左右，一表有記錄2萬(wàn)條左右，我怎樣快速查找兩表的不同記錄？ ============================ 給你一個(gè)測(cè)試方法，從northwind中的orders表取數(shù)據(jù)。 select * into n1 from orders select * into n2 from orders select * from n1 select * from n2 --添加主鍵，然后修改n1中若干字段的若干條 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 應(yīng)該可以，而且將不同的記錄的ID顯示出來(lái)。 下面的適用于雙方記錄一樣的情況， select * from n1 where orderid in (select OrderID from (select * from n1 union select * from n2) a group by OrderID having count(*) > 1) 至于雙方互不存在的記錄是比較好處理的 --刪除n1,n2中若干條記錄 delete from n1 where orderID in ('10728','10730') delete from n2 where orderID in ('11000','11001') --************************************************************* -- 雙方都有該記錄卻不完全相同 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) * 四種方法取表里n到m條紀(jì)錄： 1. select top m * into 臨時(shí)表(或表變量) from tablename order by columnname -- 將top m筆插入 set rowcount n select * from 表變量 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里沒(méi)有其他identity列，那么： select identity(int) id0,* into #temp from tablename 取n到m條的語(yǔ)句為： select * from #temp where id0 >=n and id0 <= m 如果你在執(zhí)行select identity(int) id0,* into #temp from tablename這條語(yǔ)句的時(shí)候報(bào)錯(cuò),那是因?yàn)槟愕腄B中間的select into/bulkcopy屬性沒(méi)有打開(kāi)要先執(zhí)行： exec sp_dboption 你的DB名字,'select into/bulkcopy',true
4.如果表里有identity屬性，那么簡(jiǎn)單： select * from tablename where identitycol between n and m * 如何刪除一個(gè)表中重復(fù)的記錄？ create table a_dist(id int,name varchar(20)) insert into a_dist values(1,'abc') insert into a_dist values(1,'abc') insert into a_dist values(1,'abc') insert into a_dist values(1,'abc') exec up_distinct 'a_dist','id' select * from a_dist create procedure up_distinct(@t_name varchar(30),@f_key varchar(30)) --f_key表示是分組字段
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