Richard Broersma Jr wrote on 22.09.2006 21:25:
I am sure this is simple, but I don't get it. I am new to PGSQL, coming from
MySQL - in mysql, you can autoincrement the primary key; in postgre, I am
not sure how to do this. I have read the documentation, and tried "nextval"
as the default - I have searched for the datatype SERIAL, but I am using
navicat and this datatype is not supported. Can someone tell me how to do
this - I just want the integer value for a primary key to autoincrement by
one.
CREATE TABLE bar (id SERIAL PRIMARY KEY);
Is just shorthand notation for:
CREATE SEQUENCE foo START 1;
CREATE TABLE bar (id integer PRIMARY KEY DEFAULT nextval('bar'));
Well the shorthand notation has a minor gotcha: you cannot drop the sequence
that has been created automatically. Only if you drop the column itself. Should
not be a problem, but it is a difference between a SERIAL PRIMARY KEY definition
and the "verbose" mode
Thomas
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
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