where num between 4 and 6
select top 3 * from student
where sId not in ( select top 6 sId from student order by sId desc)
(
insert into [user] ( name, level ) values (' 犀利哥 ', 1 )
select * from
select * from score
[uId] int identity( 1 ,1 ) primary key,

-- 练习
inner join class on sClassId = cId
--结果如下
-- 查询所有学生的姓名、年龄及所在班级
inner join class on sClassId = cId
else 0
delete from score where studentId in
end
select [name] ,
-- 实现分页
end as '支出 '
-- 外连接
isnull (sum ( case subject
when amount < 0 then abs ( amount)
when ' 物理 ' then result
[level] int --1骨灰大虾菜鸟
( select sId from student where sName in ( '刘备 ' ,' 关羽 ', ' 张飞' ))
insert into test( number ,amount ) values ( 'RK2', 20 )
when 3 then '菜鸟 '
-- 查询年龄超过岁的学生的姓名、年龄及所在班级
select
( select row_number () over (order by sId desc ) as num,* from student ) as t
-- 表连接
( select sId from student where sName in ( '刘备 ' ,' 关羽 ', ' 张飞' ))
(

复制代码 代码如下:

order by english
number varchar ( 10),

create database demo
select * from class
INSERT INTO student0 VALUES (' 张三 ', ' 物理' , 85)
case
[name] varchar ( 50),
-- 上面是sql 2000 以前的实现方式。 SQLServer2005 后增加了Row_Number 函数简化实现。
amount int
INSERT INTO student0 VALUES (' 张三 ', ' 语文' , 80)
use myschool
else ' 差 '
-- 交叉连接cross join
case [level]
-- 查询到的学生
-- 查询刘关张的成绩
insert into test( number ,amount ) values ( 'RK1', 10 )
--case end 第二种用法，相当于多重 if 语句

case
-- 如果子查询是多行单列的子查询，这样的子查询的结果集其实是一个集合。可以使用 in 关键字代替 =号
-- 内连接inner join...on...
select * from
case
group by [name]
end ),0 ) as '数学 ' ,
from test

where sId not in ( select top 3 sId from student order by sId desc)
end ,
-- 子查询返回的值不止一个。当子查询跟随在 = 、!= 、 <、 <= 、> 、 >= 之后
inner join student on sClassId = cId
( select cId from class where cName in ( '高一一班 ' ,' 高二一班 '))
-- 查询高一一班 高二一班所有的学生
end ),0 ) as '语文 ' ,
-- 删除刘关张
end as '收入 ' ,
when english >= 60 and english < 70 then ' 可 '
use MySchool
from student0
order by sId desc


select * from
select sName , sAge, cName ,sSex from student
select * from student
when 1 then '骨灰 '
create table test

when amount > 0 then amount
where sSex =' 女 '
where num between 3 *( 3- 1 ) + 1 and 3 *3
( select cId from class where cName = '高一一班 ' )
select * from score

INSERT INTO student0 VALUES (' 李四 ', ' 数学' , 92)
( select row_number () over (order by sId desc ) as num,* from student ) as t
from score
)
-- 表中有A B C 三列 ,用 SQL 语句实现：当 A列大于 B 列时选择A 列否则选择 B 列，当B 列大于 C列时选择 B 列否则选择 C列。
select * from student
--case end 单值判断 相当于 switch case
select sName , sAge, cName from class
-- 子查询跟在比较运算符之后，要求子查询只返回一个值
create table [user]
when english >=90 then ' 优 '
-- 有一张表student0 ，记录学生成绩
--sql 2005 中的分页

when b > c then b
-- 查询高一一班所有的学生
INSERT INTO student0 VALUES (' 张三 ', ' 数学' , 90)
select top 3 * from student
insert into [user] ( name, level ) values (' 小月月 ', 2 )
end as '成绩 '

select number ,
( select row_number () over (order by sId desc ) as num,* from student ) as t
-- 被当作结果集的查询语句被称为子查询。所有可以使用表的地方几乎都可以使用子查询来代替。
when a > b then a
isnull (sum ( case subject
when 2 then '大虾 '
--left join...on...
from T
insert into test( number ,amount ) values ( 'RK4',- 10 )

-- 查询第到个学生
select * from student where sClassId in
select * from score where studentId in
select [name] ,

insert into [user] ( name, level ) values (' 芙蓉姐姐 ', 3 )
insert into test( number ,amount ) values ( 'RK3',- 30 )
select * from student where sClassId =
when english >=80 and english <90 then ' 良 '
use demo
else c
CREATE TABLE student0 ( name nvarchar (10 ), subject nvarchar (10 ), result int )
order by sId desc
end as '等级 '
select sName , sAge, cName from class
case
where sAge > 20
INSERT INTO student0 VALUES (' 李四 ', ' 物理' ,null)
select 1,( select sum ( english) from score ) as ' 和 ',( select avg ( sAge) from student ) as ' 平均年龄 '
where num between 7 and 9
select studentId ,
select sName from ( select * from student ) as t
select * from student where sClassId =
)
else 0

复制代码 代码如下:

where num between 1 and 3
isnull (sum ( case subject
INSERT INTO student0 VALUES (' 李四 ', ' 语文' , 85)
--then 后面的返回值类型必须一致
-- 最近入学的个学生
else b
from [user]
select top 3 * from student
case
select * from
( select row_number () over (order by sId desc ) as num,* from student ) as t
order by sId desc
when ' 数学 ' then result
-- 子查询将一个查询语句做为一个结果集供其他 SQL 语句使用，就像使用普通的表一样，

when english >=70 and english < 80 then ' 中 '

select * from student0
when ' 语文 ' then result
end ),0 ) as '物理 '
( select cId from class where cName in ( '高一一班 ' ,' 高二一班 '))
cross join class

use demo