Mysql 設定主鍵自動增長起始值

比較鬱悶昨天在家使用『alter table `tablename` auto_increment=10000;』怎麼也不起效，但是今天下班時間公司一同事嘗試了一下就可以了。搞不明白自己當時是怎麼操作的，導致最終不起效。

實現目標：mysql下將自增主鍵的值，從10000開始，即實現自增主鍵的種子為10000。

建立自增主鍵之後，使用alter table `tablename` auto_increment=10000實現修改表起始值。

drop

table
ifexists
`trace_test`;
create
table
`trace_test` (
`id` 
int(11) not
null
auto_increment,
`name` 
varchar(255) default
null, 
primary
key(`id`)
) engine
=innodb default charset=
utf8 ;
alter
table `trace_test` auto_increment=
10000
;insert
into `trace_test`(`name`)values('
name2');
select
*from `trace_test`;

result:

id     name

10000 name2

drop

table
ifexists
`trace_test`;
create
table
`trace_test` (
`id` 
int(11) not
null
auto_increment,
`name` 
varchar(255) default
null, 
primary
key(`id`)
) engine
=innodb auto_increment 10000
default charset=
utf8 ;
insert
into `trace_test`(`name`)values('
name2');
select
*from `trace_test`;

result：

id     name

10000 name2

drop

table
ifexists
`trace_test`;
create
table
`trace_test` (
`id` 
int(11) not
null
auto_increment,
`name` 
varchar(255) default
null, 
primary
key(`id`)
) engine
=innodb default charset=
utf8 ;
insert
into `trace_test`(`name`)values('
name1');
select
*from
`trace_test`;
truncate
table
`trace_test`;
alter
table `trace_test` auto_increment=
10000
;insert
into `trace_test`(`name`)values('
name2');
select
*from `trace_test`;

result1:

id     name

10000 name

result2:

id     name

10000 name2

drop

table
ifexists
trace_test;
create
table
trace_test (
id int(20) not
null
auto_increment,
name 
varchar(255) default
null, 
primary
key(id)
) engine
=innodb default charset=
utf8 ;
insert
into trace_test(name)values('
name1');
select
*from
trace_test;
delete
from
`trace_test`;
alter
table trace_test auto_increment=
10000
;insert
into trace_test(name)values('
name2');
select
*from trace_test;

result1:

id     name

10000 name

result2:

id     name

10000 name2

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