I meet some errors when using auto_increment in MySQL. code is here: user_id bigint(20)

Question

Editorial Team

Asked: May 21, 20262026-05-21T05:47:08+00:00 2026-05-21T05:47:08+00:00

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 auto_increment

it works. why?

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Editorial Team · Answer 1 · 2026-05-21T05:47:09+00:00

Editorial Team

This should work:


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

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