Error when use auto_increment in MySQL

I meet some errors when using auto_increment in MySQL.

code is here:

user_id bigint(20) unsigned not null auto_increment=1000

but when I try

user_id bigint(20) unsigned not null au开发者_如何学编程to_increment

it works. why?

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This should work:

create table test1 (
id int unsigned not null auto_increment,
primary key (id)
)auto_increment=100;

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Are you trying to seed the auto increment number?

If so, the syntax is part of the CREATE|ALTER TABLE command.

See http://dev.mysql.com/doc/refman/5.5/en/example-auto-increment.html

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This happens because auto increment is set for the table and not a particular column. So to start from 1000, Create a table column with just auto_increment

And then alter the table using

ALTER TABLE your_table_name AUTO_INCREMENT=1000;

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auto increment of mysql is only +1 value.

look at this http://dev.mysql.com/doc/refman/5.0/en/example-auto-increment.html