分页提取和游标 ,待补充，游标的类型

 1.分页提取数据，偏移2个，每页3个。

--select * FROM  Person
--where Age > 18
--ORDER BY id  -- 必须有orderby，否则报错
--offset 2 rows fetch next 3 rows only

2.游标方式

https://learn.microsoft.com/zh-cn/sql/t-sql/language-elements/declare-cursor-transact-sql?view=sql-server-ver16

ISO Syntax
DECLARE cursor_name [ INSENSITIVE ] [ SCROLL ] CURSOR
FOR select_statement
[ FOR { READ ONLY | UPDATE [ OF column_name [ ,...n ] ] } ]
[;]
Transact-SQL Extended Syntax
DECLARE cursor_name CURSOR [ LOCAL | GLOBAL ]
[ FORWARD_ONLY | SCROLL ]
[ STATIC | KEYSET | DYNAMIC | FAST_FORWARD ]
[ READ_ONLY | SCROLL_LOCKS | OPTIMISTIC ]
[ TYPE_WARNING ]
FOR select_statement
[ FOR UPDATE [ OF column_name [ ,...n ] ] ]
[;]

  
--Declare curlscroll  CURSOR scroll 
  --FOR select *
  --FROM Person
  --where Ahe > 18
  --ORDER BY id

  FETCH last from curlStatic;
  select 'next_fetch执行情况'=@@FETCH_STATUS
  Select @@CURSOR_ROWS 

https://blog.csdn.net/lin_lujian/article/details/6914230