--eg1:表里增加字段
CREATE TABLE t7(id int IDENTITY(100,1));
--eg2:
--自动增长的函数
create function iden()
returns int
as
begin
declare @a1 int
set @a1 = 1
while exists(select * from table_name where id=@a1)
set @a1 = @a1 + 1
return @a1
end
--eg3: 虚拟表
select identity(int,1,1) kk,* into #t from T
select #t
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