一.select into from 语句形式为:Insert into Table2(field1,field2,...) select value1,value2,... from Table1 应用场景:常用于创建表的备份复件或者用于对记录进行存档 example1: example2: SELECT Persons.LastName,Orders.OrderNo INTO Persons_Order_Backup FROM Persons INNER JOIN Orders ON
数据库查询的基本格式为: select ----输出(显示)你要查询出来的值 from -----查询的依据 where -----筛选条件(对依据(数据库中存在的表)) group by -----对筛选后的数据 进行分组 having ----- 筛选条件(对分组后的结果再次筛选) order by -----将结果进行排序 注意:基本语法格式顺序不能变,顺序不能变,但可以缺省 表结构操作 表结构操作是需要去修改表结构,使用的关键字是alter,其他方式无法对表进行操作的时候,比如,新增列,
Schema是Object的容器,授予对Schema访问的权限,就是授予对Schema下所有object的访问权限. 一,Schema 是object的container The new schema is owned by one of the following database-level principals: database user, database role, or application role. Objects created within a schema are ow
SQL Server T-SQL高级查询 高级查询在数据库中用得是最频繁的,也是应用最广泛的. Ø 基本常用查询 --select select * from student; --all 查询所有 select all sex from student; --distinct 过滤重复 select distinct sex from student; --count 统计 select count(*) from student; select count(sex) from student
基本常用查询 --select select * from student; --all 查询所有 select all sex from student; --distinct 过滤重复 select distinct sex from student; --count 统计 select count(*) from student; select count(sex) from student; select count(distinct sex) from student; --top 取
name like 'ja%'; select * from student where name not like '%[j,n]%'; select * from student where name like '%[j,n,a]%'; select * from student where name like '%[^ja,as,on]%'; select * from student where name like '%[ja_on]%'; --in 子查询 , ); --not in
SQL Server T-SQL高级查询 高级查询在数据库中用得是最频繁的,也是应用最广泛的. Ø 基本常用查询 --select select * from student; //查询student表中所有字段. --all 查询所有 select all sex from student; --distinct 过滤重复 select distinct sex from student; --count 统计 select count(*) from student; selec
--创建登陆用户 --create login login_name from windows with default_database = database | default_language = language; create login [localhost\hoojo-pc] from windows with default_database = testHome; --创建登陆用户 --create login login_name with password = 'pwd'
高级查询在数据库中用得是最频繁的,也是应用最广泛的. Ø 基本常用查询 --select select * from student; --all 查询所有 select all sex from student; --distinct 过滤重复 select distinct sex from student; --count 统计 select count(*) from student; select count(sex) from student; select count(di
高级查询在数据库中用得是最频繁的,也是应用最广泛的. Ø 基本常用查询 --select select * from student; --all 查询所有 select all sex from student; --distinct 过滤重复 select distinct sex from student; --count 统计 select count(*) from student; select count(sex) from student; select count(
高级查询在数据库中用得是最频繁的,也是应用最广泛的. Ø 基本常用查询 --select select * from student; --all 查询所有 select all sex from student; --distinct 过滤重复 select distinct sex from student; --count 统计 select count(*) from student; select count(sex) from student; select count(
--select select * from student; --all 查询所有 select all sex from student; --distinct 过滤重复 select distinct sex from student; --count 统计 select count(*) from student; select count(sex) from student; select count(distinct sex) from student; --top 取前N条记录 s
一:基本的查询sql 1:基本常用查询 select * from student; --select select all sex from student; --all 查询所有 select distinct sex from student; --distinct 过滤重复 --count 统计 select count(*) from student; select count(sex) from student; select count(distinct sex) from stu