sql中as的用法和一些经典的sql语句.doc

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.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.idtable2.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 11 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 DECFROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate, b.factration FROM TELFEESTAND a, TELFEE b WHERE 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 Handl