1、说明：复制表(只复制结构,源表名：a 新表名：b) (Access可用)法一：select
* into b from a where 1<>1法二：select
top 0 * into b from a2、说明：拷贝表(拷贝数据,源表名：a 目标表名：b) (Access可用)insert into b(a, b, c) select
d,e,f from
a;3、说明：跨数据库之间表的拷贝(具体数据使用绝对路径) (Access可用)insert into b(a, b, c) select
d,e,f from
a in ‘具体数据库’ where
条件例子：..from
b in ‘"&Server.MapPath(".")&"\data.mdb" &"‘
where..4、说明：子查询(表名1：a 表名2：b)select
a,b,c from
a where a IN (select d from b ) 或者: select
a,b,c from
a where a IN (1,2,3)5、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) b6、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.c7、说明：在线视图查询(表名1：a )select
* from (SELECT a,b,c FROM
a) T where
t.a > 1;8、说明：between的用法,between限制查询数据范围时包括了边界值,not
between不包括select
* from table1 where
time between time1 and time2select
a,b,c, from
table1 where
a not between 数值1 and 数值29、说明：in
的使用方法select
* from table1 where
a [not] in
(‘值1’,’值2’,’值4’,’值6’)10、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 table1 where
not exists ( select
* from table2 where
table1.field1=table2.field1 )11、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
.....12、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())>513、说明：一条sql 语句搞定数据库分页select
top 10 b.* from
(select top 20 主键字段,排序字段 from
表名 order by 排序字段 desc) a,表名 b where
b.主键字段 = a.主键字段 order
by a.排序字段 asc15、说明：选择在每一组b值相同的数据中对应的a最大的记录的所有信息(类似这样的用法可以用于论坛每月排行榜,每月热销产品分析,按科目成绩排名,等等.)select
a,b,c from
tablename ta where
a=(select max(a) from
tablename tb where
tb.b=ta.b)16、说明：包括所有在 TableA 中但不在 TableB和TableC 中的行并消除所有重复行而派生出一个结果表(select
a from tableA ) except
(select a from tableB) except
(select a from tableC)17、说明：随机取出10条数据select
top 10 * from tablename order
by
newid()18、说明：随机选择记录select
newid()19、说明：删除重复记录Delete
from tablename where
id not in (select max(id) from
tablename group
by col1,col2,...)20、说明：列出数据库里所有的表名select
name from sysobjects where
type=‘U‘ 21、说明：列出表里的所有的select
name from syscolumns where
id=object_id(‘TableName‘)22、说明：列示type、vender、pcs字段，以type字段排列，case可以方便地实现多重选择，类似select
中的case。select
type,sum(case
vender when
‘A‘ then pcs else 0 end),sum(case
vender when
‘C‘ then pcs else 0 end),sum(case
vender when
‘B‘ then pcs else 0 end) FROM
tablename group
by
type显示结果：type vender pcs电脑 A 1电脑 A 1光盘 B 2光盘 A 2手机 B 3手机 C 323、说明：初始化表table1TRUNCATE
TABLE table124、说明：选择从10到15的记录select
top 5 * from (select top 15 * from table order by
id asc) www.818u.com order
by id desc25、随机读取若干条记录Access语法：SELECT
top 10 * From 表名 ORDER BY
Rnd(id)Sql server语法：select
top n * from 表名 order by
newid()MySql语法：Select
* From 表名 Order By rand() Limit n26、使用SQL语句 用...代替过长的字符串显示语法：SQL数据库：select
case when
len(field)>10 then
left(field,10)+‘...‘
else field end as news_name,news_id from
tablenameAccess数据库：SELECT
iif(len(field)>2,left(field,2)+‘...‘,field) FROM
tablename; |
原文：http://www.cnblogs.com/2013likong/p/3590325.html