數據庫_語句大全

幾個簡單的根基的sql語句
選擇：select * from table1 where 規模
插入：insert into table1(field1,field2) values(value1,value2)
刪除：delete from table1 where 規模
更新：update table1 set field1=value1 where 規模
查找：select * from table1 where field1 like ’%value1%’ ---like的語法很精妙，查資料!
排序：select * from table1 order by field1,field2 [desc]
總數：select count * as totalcount from table1
乞降：select sum(field1) as sumvalue from table1
平均：select avg(field1) as avgvalue from table1
最年夜：select max(field1) as maxvalue from table1
最小：select min(field1) as minvalue from table1


還有些不錯的SQL語句
1、聲名：複製表(只複製結構,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、聲名：拷貝表(拷貝數據,源表名：a 方針表名：b) (Access可用)
insert into b(a, b, c) select d,e,f from b;
3、聲名：跨數據庫之間表的拷貝(具體數據使用絕對路徑) (Access可用)
insert into b(a, b, c) select d,e,f from b in ‘具體數據庫’ where 前提
例子：..from b in '"&Server.MapPath(".")&"\data.mdb" &"' where..
4、聲名：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、聲名：顯示文章、提交人和最後回覆時刻
select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where
table.title=a.title) b
6、聲名：外毗連查詢(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、聲名：在線視圖查詢(表名1：a )
select * from (Select a,b,c FROM a) T where t.a > 1;
8、聲名：between的用法,between限制查詢數據規模時蒐羅了鴻溝值,not between不蒐羅
select * from table1 where time between time1 and time2
select a,b,c, from table1 where a not between 數值1 and 數值2
9、聲名：in 的使用體例
select * from table1 where a [not] in (‘值1’,’值2’,’值4’,’值6’)
10、聲名：兩張聯繫關係表，刪除主表中已經在副表中沒有的信息
delete from table1 where not exists ( select * from table2 where table1.field1=table2.field1 )
11、聲名：四表聯盤問題：
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、聲名：曰程放置提前五分鐘提醒
SQL: select * from 曰程放置 where datediff('minute',f起頭時刻,getdate())>5
13、聲名：一條sql 語句搞定數據庫分頁
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、聲名：前10筆記實
select top 10 * form table1 where 規模
15、聲名：選擇在每一組b值不異的數據中對應的a最年夜的記實的所有信息(近似這樣的用法可以用於論壇每月排
行榜,每月熱銷產物剖析,按科目成就排名,等等.)
select a,b,c from tablename ta where a=(select max(a) from tablename tb where tb.b=ta.b)
16、聲名：蒐羅所有在 TableA 中但不在 TableB和TableC 中的行並消弭所有一再行而派生出一個功效表
(select a from tableA ) except (select a from tableB) except (select a from tableC)
17、聲名：隨機掏出10條數據
select top 10 * from tablename order by newid()
18、聲名：隨機選擇記實
select newid()
19、聲名：刪除一再記實
Delete from tablename where id not in (select max(id) from tablename group by col1,col2,...)
20、聲名：列出數據庫裏所有的表名
select name from sysobjects where type='U'