Re: MySQL to Postgres question

Edward Blake wrote:
> The table I have in MySQL is similar to below:
>
> 0 SET FOREIGN_KEY_CHECKS=0;
> 1 CREATE TABLE products (
> 2 product_id integer(11) not null auto_increment,
> 3 product_name varchar(255) not null,
> 4 product_descrition varchar(255) not null,
> 5 class_id integer(11) not null,
> 6 subclass_id integer(11) not null,
> 7 department_id integer(11) not null
> 8 PRIMARY KEY (product_id),
> 9 KEY class_id (class_id),
> 10 KEY subclass_id (subclass_id),
> 11 KEY department_id (department_id)
> 12 );
>
> When I try and rewrite it as a Postgres statement (below), it fails at
> line 9.
> 0 SET CONSTRAINTS ALL DEFERRED;
> 1 CREATE TABLE products (
> 2 product_id serial[11] not null,
> 3 product_name varchar[255] not null,
> 4 product_descrition varchar[255] not null,
> 5 class_id integer[11] not null,
> 6 subclass_id integer[11] not null,
> 7 department_id integer[11] not null
> 8 PRIMARY KEY (product_id),
> 9 KEY class_id (class_id),
> 10 KEY subclass_id (subclass_id),
> 11 KEY department_id (department_id)
> 12 );
>
> Any ideas?

Another way to do auto increment fields is create your own sequences.

Also according to what i have read from the postgresql documents there
is no performance difference between varchar and text.

create sequence my_auto_increment
INCREMENT 1
START 1
CACHE 1;

CREATE TABLE products (
product_id integer primary key default
nextval(('my_auto_increment'::text)::regclass),
product_name text not null,
product_descrition text not null,
class_id integer not null,
subclass_id integer not null,
department_id integer not null);