SQL Server中的分页查询 select top

SQL Server中的分页查询 https://blog.csdn.net/tswc_byy/article/details/82053091

零、码仙励志

比我差的人还没放弃，比我好的人仍在努力，我就更没资格说我无能为力

一、建库和建表

create database scort
use scort
create table emp
(
	empno int primary key,
	ename nvarchar(10),
	sal int,
	deptno int
)
insert into emp values (7369,'smith',800,20);
insert into emp values (7499,'allen',1600,10);
insert into emp values (7521,'ward',1250,30);
insert into emp values (7566,'jones',2975,30);
insert into emp values (7654,'martin',1250,10);
insert into emp values (7698,'blake',2850,30);
insert into emp values (7782,'clark',2450,20);
insert into emp values (7788,'scott',3000,20);
insert into emp values (7839,'king',5000,10);
insert into emp values (7844,'turn',1500,10);
insert into emp values (7876,'adams',1100,30);

二、分页查询的用法

1.公式：

假设每页显示n条记录，当前显示的是第m页，表名是A，主键是A_id
select top n *
	from A
	where A_id not in (select top (m-1)*n A_id from A)

2.实例演示：

sal从高到低排序，输出1-3条记录的信息
select top 3 * from emp order by sal desc

sal从高到低排序，输出4-6条记录的信息
select top 3 *
	from emp
	where sal not in (select top 3 sal from emp order by sal desc)
	order by sal desc

sal从高到低排序，输出7-9 条记录的信息
select top 3 *
	from emp
	where sal not in (select top 6 sal from emp order by sal desc)
	order by sal desc

sal从高到低排序，输出10-12条记录的信息
（因为没有第12条记录，所以只显示了2条）
select top 3 *
	from emp
	where sal not in (select top 9 sal from emp order by sal desc)
	order by sal desc