sql中as的用法和一些經(jīng)典的sql語句2008-08-21 21:55總結(jié)一些工作中用到或碰到的SQL語句，希望能與大家分享，同時(shí)也希望大家能提供更多的精妙SQL語句.....
1、delete table1 from (select * from table2) as t2 where table1.id=t2.id
2、truncate table table1 (不在事務(wù)日志中做記錄，比delete table快，但不能激活觸發(fā)器)
3、update table1 set column=column+1 where id=(select id from table2)
4、update table1 set column=column+1 from table1,table2 where table1.id=table2.id
5、select top n [Percent] * from table1 '輸出百分比記錄
6、select id,column1 * column2 as column from table1 '可算明白as的用法了
7、select * from table1 where column1 like 'SQL#_G_O' escape '#' '單匹配
8、select table1.id from table1 where not exists (select table2.id from table2 where table1.id=table2.id) '這個(gè)應(yīng)該比not in快一些
9、select table1.id from table1,table2 where table1.id<>table2.id '看復(fù)合查詢機(jī)制
10、select table1.id from table1,table2,(select id from table3) as t3 where table1.id=table2.id and table2.id=t3.id '有些類似[1]了......
11、select * from table1 where column1 like '[A]%' or like '[^B]%'
12、select @column1=column1 from table1;select @column1 as column1 '存儲(chǔ)到自定義變量
13、select * from table1 where contains(column1,'char1 or char2*') '全文索引
14、select * from table1 where contains(column1,'前有 near 中有 near 后有')
15、select * from table1 where contains(column1,'formsof(inflectional,go)') '派生
16、select * from table1 where contains(description,'isabout(apple weight(.9),boy weight(.8),china weight(.7))') '權(quán)重
17、select * from table1 where freetext(column1,'char') '僅支持文字不支持表達(dá)式搜索
18、insert into table1 select column1,count(column1) from table2 group by column1 '統(tǒng)計(jì)
-----------------------------------------------------------------------------------------
1 說明：復(fù)制表(只復(fù)制結(jié)構(gòu),源表名：a 新表名：b)
SQL: select * into b from a where 1<>1
2 說明：拷貝表(拷貝數(shù)據(jù),源表名：a 目標(biāo)表名：b)
SQL: insert into b(a, b, c) select d,e,f from b;
3 說明：顯示文章、提交人和最后回復(fù)時(shí)間
SQL: select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b
4 說明：外連接查詢(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
5 說明：日程安排提前五分鐘提醒
SQL: select * from 日程安排 where datediff('minute',f開始時(shí)間,getdate())>5
6 說明：兩張關(guān)聯(lián)表，刪除主表中已經(jīng)在副表中沒有的信息
SQL:
delete from info where not exists ( select * from infobz where info.infid=infobz.infid )
7 說明：
從數(shù)據(jù)庫(kù)中去一年的各單位電話費(fèi)統(tǒng)計(jì)(電話費(fèi)定額和電話費(fèi)清單兩個(gè)表來源）
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')
8 說明：四表聯(lián)查問題：
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 .....
9 說明：得到表中最小的未使用的ID號(hào)
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)
10 說明：模糊查詢，單字匹配(短橫線代表待匹配內(nèi)容)
select * from table where field1 like 'A_B_C'
11 說明：as的用法
select id,column1 * column2 as column from table1
聯(lián)系客服
