sql中as的用法和一些经典的sql语句

2008-08-21 21:55

总结一些工作中用到或碰到的SQL语句，希望能与大家分享，同时也希望大家能提供更多的精妙SQL语句.....

1、delete table1 from (select * from table2) as t2 where table1.id=t2.id

2、truncate table table1 (不在事务日志中做记录，比delete table快，但不能激活触发器)

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 '输出百分比记录

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 '#' '单匹配

8、select table1.id from table1 where not exists (select table2.id from table2 where table1.id=table2.id) '这个应该比not in快一些

9、select table1.id from table1,table2 where table1.id<>table2.id '看复合查询机制

10、select table1.id from table1,table2,(select id from table3) as t3 where table1.id=table2.id and table2.id=t3.id '有些类似[1]了......

11、select * from table1 where column1 like '[A]%' or like '[^B]%'

12、select @column1=column1 from table1;select @column1 as column1 '存储到自定义变量

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))') '权重

17、select * from table1 where freetext(column1,'char') '仅支持文字不支持表达式搜索

18、insert into table1 select column1,count(column1) from table2 group by column1 '统计

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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 1<>1

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 b;

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 OUT 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 )

7 说明：

从数据库中去一年的各单位电话费统计(电话费定额和电话费清单两个表来源） 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') 8 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 .....

9 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) 10 说明：模糊查询，单字匹配(短横线代表待匹配内容)

select * from table where field1 like 'A_B_C'

11 说明：as的用法

select id,column1 * column2 as column from table1

第二篇：sql的as的用法和一些经典的sql语句

sql的as的用法和一些经典的sql语句.txtsql的as的用法和一些经典的sql语句--------------------------------------------------------------------------------作者：未知 发布时间：2008-08-26 08:50:06 来源：网络总结一些工作中用到或碰到的SQL语句，希望能与大家分享，同时也希望大家能提供更多的精妙SQL语句1、delete table1 from (select * from table2) as t2 where table1.id=t2.id2、truncate table table1 (不在事务日志中做记录，比delete table快，但不能激活触发器)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.id5、select top n [Percent] * from table1 '输出百分比记录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 '#' '单匹配8、select table1.id from table1 where not exists (select table2.id from table2 where table1.id=table2.id) '这个应该比not in快一些9、select table1.id from table1,table2 where table1.id<>table2.id '看复合查询机制10、select table1.id from table1,table2,(select id from table3) as t3 where table1.id=table2.id and table2.id=t3.id '有些类似[1]了......11、select * from table1 where column1 like '[A]%' or like '[^B]%'12、select @column1=column1 from table1;select @column1 as column1 '存储到自定义变量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))') '权重17、select * from table1 where freetext(column1,'char') '仅支持文字不支持表达式搜索18、insert into table1 select column1,count(column1) from table2 group by column1 '统计-----------------------------------------------------------------------------------------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 1<>1 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 b; 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 OUT 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.in

fid=infobz.infid ) 7 说明：从数据库中去一年的各单位电话费统计(电话费定额和电话费清单两个表来源）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 DECFROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate, b.factrationFROM TELFEESTAND a, TELFEE bWHERE a.tel = b.telfax) aGROUP BY a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, 'yyyy') 8 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 ..... 9 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 HandleIDFROM HandleWHERE NOT HandleID IN (SELECT a.HandleID - 1 FROM Handle a) 10 说明：模糊查询，单字匹配(短横线代表待匹配内容) select * from table where field1 like 'A_B_C' 11 说明：as的用法 select id,column1 * column2 as column from table1