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OID is auto-incrementing integer value, unique within a PostgreSQL database (not just a table) that can be automatically assigned to each row of a table created WITH OIDS option. Although OID can be used as an identity (auto-increment) primary key column, it is recommended to use SERIAL data type instead. For more information, see Generating IDs in PostgreSQL. SQL Server 2012 introduced Sequence Object, and since beginning SERIAL/BIGSERIAL (Sequence Object) are available in PostgreSQL. The new IDENTITY Type Column is used to generate an automatic number. Now, we have this great feature, and creating an auto-increment column is also very simple.

1. Postgresql Serial Vs Bigserial 4
2. Postgresql Insert Serial
3. Postgres Serial Or Bigserial
4. Postgresql Serial Vs Bigserial Free

Meet The Overflow, a newsletter by developers, for developers. Fascinating questions, illuminating answers, and entertaining links from around the web. Each data type has an external representation determined by its input and output functions. Many of the built-in types have obvious external formats. However, several types are either unique to PostgreSQL, such as geometric paths, or have several possible formats, such as the date and time types. The type names serial and serial4 are equivalent: both create integer columns. The type names bigserial and serial8 work the same way, except that they create a bigint column. Bigserial should be used if you anticipate the use of more than 2 31 identifiers over the lifetime of the table.

I did some research but can't find the exact answer that I look for. Currently I have a primary key column 'id' which is set to serial but I want to change it to bigserial to map to Long in Java layer. What is the best way to achieve this considering this is a existing table? I think my Postgres version is 10.5. Also I am aware that both serial and bigserial are not a data type.

user3123690user3123690

1 Answer

In Postgres 9.6 or earlier the sequence created by a serial column already returns bigint. You can check this using psql:

So you should only alter the type of the serial column:

The behavior has changed in Postgres 10:

Also, sequences created for SERIAL columns now generate positive 32-bit wide values, whereas previous versions generated 64-bit wide values. This has no visible effect if the values are only stored in a column.

Hence in Postgres 10+:

klinklin

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• PostgreSQL gapless sequences 1 answer

i'm new to postgres.if in sqlserver we have a table with auto-increment, and 10 rows.. and the last row have id = 10.when you delete the last row, the next you insert will get the id = 10 too.. sure?

but in postgres, using bigserial as pk, when i delete the row with the max Id, and insert a new row, it keeps incrementing more and more the pk number.

this is right?

dsolimano

marked as duplicate by Erwin Brandstetter, Craig Ringer, Daniel Vérité, Achrome, Undo♦Jun 5 '13 at 3:40

Postgresql Serial Vs Bigserial 4

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1 Answer

Postgresql Insert Serial

That's right. Read the manual about sequences.

bigserial and serial are just notational convenience for creating a bigint / integer column with the default set to nextval() from a connected sequence.

And it needs to be that way for safe concurrent use.

Erwin BrandstetterErwin Brandstetter

Postgres Serial Or Bigserial

Postgresql Serial Vs Bigserial Free

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