In this article, we’ll take a closer look at the Postgres SERIAL primary key and look at some examples of its use. See explanation. This pseudo-type is used frequently in the primary key column of a table. What I want is returning last value after insert using. PostgreSQL Serial. The fact that serial was bolted on as a fake type is a wart that maybe we shouldn't extend in this particular fashion. Active 3 years, 9 months ago. What is missing is to assign the sequence as the default value: The type names bigserial and serial8 work the same way, except that they create a bigint column. – Basil Bourque Jul 20 '19 at 17:47 ... serial is a pseudo type. Alter data type of a column to serial postgresql [duplicate] Ask Question Asked 3 years, 9 months ago. Primary keys that autoincrement (i.e., columns with data type serial primary key) are associated with a sequence.You can set the next value for any sequence using the setval(, ) function. In this section, we are going to understand the working of PostgreSQL Serial pseudo-type, which allows us to define auto-increment columns in tables. Note that to actually execute the function by itself you need to use SELECT, like this: SELECT setval(, ). SERIAL is an auto-incremented integer column that takes 4 bytes while BIGSERIAL is an auto-incremented bigint column taking 8 bytes. Re: Alter column to type serial at 2010-11-04 14:04:59 from Tom Lane Re: Alter column to type serial at 2010-11-04 16:13:04 from Alvaro Herrera Browse pgsql-hackers by date I never use serial before. The PostgreSQL SERIAL pseudo-type can be used to define auto-incremented columns in tables. And we also see examples of the PostgreSQL Serial pseudo-type.. What is PostgreSQL Serial pseudo-type? FYI, the SERIAL pseudo-type is now legacy, supplanted by the new GENERATED … AS IDENTITY feature defined in SQL:2003, in Postgres 10 and later. The table that contains the foreign key is called the referencing table or child table. Seeing as it works with adding a column, and I've seen instructions for creating a sequence, and then adding a dependency into the system tables, it's quite reasonable to expect that one day it will work with alter table alter column. very little to do with ALTER COLUMN TYPE --- most of the things it would do are not that. A foreign key is a column or a group of columns in a table that reference the primary key of another table.. When migrating to PostgreSQL, you will notice that SERIAL or BIGSERIAL column types can be used just like AUTO_INCREMENT in MySQL. The type names serial and serial4 are equivalent: both create integer columns. SELECT LASTVAL(); I read this question PostgreSQL Autoincrement. But it's probably more complicated than just making it a serial type, there's probably some question of setting the sequence according to the max value in the table. 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