時(shí)間:2015/6/28來(lái)源:IT貓撲網(wǎng)作者:網(wǎng)管聯(lián)盟我要評(píng)論(0)
1、說(shuō)明:復(fù)制表(只復(fù)制結(jié)構(gòu),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 a
2、說(shuō)明:拷貝表(拷貝數(shù)據(jù),源表名:a 目標(biāo)表名:b) (Access可用)
insert into b(a, b, c) select d,e,f from b;
3、說(shuō)明:跨數(shù)據(jù)庫(kù)之間表的拷貝(具體數(shù)據(jù)使用絕對(duì)路徑) (Access可用)
insert into b(a, b, c) select d,e,f from b in ‘具體數(shù)據(jù)庫(kù)’ where 條件
例子:..from b in ' "&Server.MapPath( ". ")& "\data.mdb " & " ' where..
4、說(shuō)明:子查詢(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、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
6、說(shuō)明:外連接查詢(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
7、說(shuō)明:在線視圖查詢(表名1:a )
select * from (SELECT a,b,c FROM a) T where t.a > 1;
8、說(shuō)明:between的用法,between限制查詢數(shù)據(jù)范圍時(shí)包括了邊界值,not between不包括
select * from table1 where time between time1 and time2
select a,b,c, from table1 where a not between 數(shù)值1 and 數(shù)值2
9、說(shuō)明:in 的使用方法
select * from table1 where a [not] in (‘值1’,’值2’,’值4’,’值6’)
10、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 table1 where not exists ( select * from table2 where table1.field1=table2.field1 )
11、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 .....
12、說(shuō)明:日程安排提前五分鐘提醒
SQL: select * from 日程安排 where datediff( 'minute ',f開(kāi)始時(shí)間,getdate())> 5
13、說(shuō)明:一條sql 語(yǔ)句搞定數(shù)據(jù)庫(kù)分頁(yè)
select top 10 b.* from (select top 20 主鍵字段,排序字段 from 表名 order by 排序字段 desc) a,表名 b where b.主鍵字段 = a.主鍵字段 order by a.排序字段
14、說(shuō)明:前10條記錄
select top 10 * form table1 where 范圍
15、說(shuō)明:選擇在每一組b值相同的數(shù)據(jù)中對(duì)應(yīng)的a最大的記錄的所有信息(類似這樣的用法可以用于論壇每月排行榜,每月熱銷產(chǎn)品分析,按科目成績(jī)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、說(shuō)明:包括所有在 TableA 中但不在 TableB和TableC 中的行并消除所有重復(fù)行而派生出一個(gè)結(jié)果表
(select a from tableA ) except (select a from tableB) except (select a from tableC)
17、說(shuō)明:隨機(jī)取出10條數(shù)據(jù)
select top 10 * from tablename order by newid()
18、說(shuō)明:隨機(jī)選擇記錄
select newid()
19、說(shuō)明:刪除重復(fù)記錄
Delete from tablename where id not in (select max(id) from tablename group by col1,col2,...)
20、說(shuō)明:列出數(shù)據(jù)庫(kù)里所有的表名
select name from sysobjects where type= 'U '
21、說(shuō)明:列出表里的所有的
select name from syscolumns where id=object_id( 'TableName ')
22、說(shuō)明:列示type、vender、pcs字段,以type字段排列,case可以方便地實(shí)現(xiàn)多重選擇,類似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
顯示結(jié)果:
type vender pcs
電腦 A 1
電腦 A 1
光盤 B 2
光盤 A 2
手機(jī) B 3
手機(jī) C 3
23、說(shuō)明:初始化表table1
TRUNCATE TABLE table1
24、說(shuō)明:選擇從10到15的記錄
select top 5 * from (select top 15 * from table order by id asc) table_別名 order by id desc
關(guān)鍵詞標(biāo)簽:sql語(yǔ)句
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