Question

MyISAM allows very convenient way to create serials.
E.g. In the table primary key is id+seq(-uence)

id seq
1  1  insert into table(seq) values(1),(2),(3),(1),(2),(1),(1),(2);
1  2
1  3
2  1
2  2
3  1
4  1
4  2

So logic is when id remains the same untill appears duplicate key, in this case (MyISAM) will increment id.

But when I try use it in InnoDB – doesn’t work. Is there a workaround (because I need transactions)?

Thanks.

May be better example from comments to Manual of MySQL Posted by [name withheld] on October 23 2003 8:41pm

create table location
(
    id bigint not null auto_increment, -- "serial" per 4.1
    longitude int,
    latitude int,
    place int,
    primary key(id, longitude, latitude, place)
);

insert into location (longitude, latitude, place)
values (0,0,0), (1,1,1), (2,2,2);

select * from foo;

+----+-----------+----------+-------+
| id | longitude | latitude | place |
+----+-----------+----------+-------+
|  1 |         0 |        0 |     0 |
|  2 |         1 |        1 |     1 |
|  3 |         2 |        2 |     2 |
+----+-----------+----------+-------+


drop table location;

create table location
(
    id bigint not null auto_increment, -- "serial" per 4.1
    longitude int,
    latitude int,
    place int,
    primary key(longitude, latitude, place, id)
);

insert into location (longitude, latitude, place)
values (0,0,0), (1,1,1), (2,2,2), (0,0,0);

select * from location order by id;

+----+-----------+----------+-------+
| id | longitude | latitude | place |
+----+-----------+----------+-------+
|  1 |         0 |        0 |     0 |
|  1 |         1 |        1 |     1 |
|  1 |         2 |        2 |     2 |
|  2 |         0 |        0 |     0 |
+----+-----------+----------+-------+

Answer 1

But when I try use it in InnoDB – doesn’t work. Is there a workaround (because I need transactions)?

You can work around it using advisory locks and triggers.

See this identical question for PostgreSQL. You’ll want to write the MySQL version of the same.