TSQL 自定义流水号 触发器 j9988

drop table dbo.num_tb
drop table dbo.tb
create table num_tb(d datetime, id int)
insert num_tb
select '2004-01-01', 1
CREATE TABLE [tb]
(
    [AutoID] [bigint] IDENTITY(1,1) NOT NULL,
    [id] [varchar](20) NULL,
    [name] [varchar](10) NULL,
    [CreateTime] [datetime] default getdate(),
    CONSTRAINT [PK_tb] PRIMARY KEY CLUSTERED 
    (
        [AutoID] ASC
    )
) ON [PRIMARY]
create unique nonclustered index idx_id_tb on tb(id)
go
create trigger tri_tb on tb
INSTEAD OF INSERT
as
begin
    set nocount on
    declare @i int
            --,@id varchar(20)
            ,@j int
    select
        @i = count(*)
    from inserted
    begin tran
        declare @now varchar(14), @latest varchar(14)
        update num_tb with(TABLOCKX)
        set 
            @now = replace(replace(replace(convert(varchar(19), getdate(), 120), '-', ''), ' ',''), ':', ''),
            @latest = replace(replace(replace(convert(varchar(19), d, 120), '-', ''), ' ',''), ':', ''),
            id = (
                    case
                        when  @latest = @now
                                then id + @i
                        else
                                @i
                    end
                ),
            @j = (
                    case
                        when @latest = @now
                            then id
                        else
                            0
                    end
                ),
                d = getdate()
    commit tran
    select *
        into #t
    from inserted
    update #t
    set id = @now
             + right('000000' + rtrim(@j), 6)
        ,@j = @j + 1
    insert tb (id, name)
    select id,name 
    from #t
end
go
--创建表
go
--插入记录测试
declare @i int
set @i=0
while @i< = 1000
begin
    insert into tb(name) values('张三')
    insert into tb(name)
    select '张四' union all
    select '张五' union all
    select '张六' union all
    select '张七' union all
    select '张八' union all
    select '张九' union all
    select '张十'
    set @i = @i + 1
end
select MAX(id),MIN(id),COUNT(*),
MAX(AutoID),MIN(AutoID),MAX(CreateTime),MIN(CreateTime)
from tb
group by LEFT(id, 14)
order by 3 desc
select * from tb a
where exists 
(select 1 from tb where id > a.id and AutoID < a.AutoID)
--truncate table tb