PostgreSQL follows the RFC 4122 standards for UUIDs.The UUID data type is unique as compared to the serial data type.A universally unique identifier serves as an identifier used for generating a unique value within a database.By default, this extension is unavailable we need to create this after installation to use a UUID data type. The above command creates a UUID-OSSP extension if it does not exist in the database.The below example states that to create an extension of UUID-OSSP is as follows.ĬREATE EXTENSION IF NOT EXISTS "uuid-ossp".To use the UUID function, we need to create an extension of UUID-OSSP in PostgreSQL.How does UUID data type work in PostgreSQL? To use this function, we need to create an extension of UUID-OSSP in PostgreSQL. We can generate a UUID number by using this function. uuid_generate_v4 – This is defined as generating UUID numbers using only random numbers.uuid_generate_v1 – This is defined as a generated UUID number using a combination of the computer’s Mac address, the current timestamp, and any random number. ![]() We can select a value of uuid_generate_v1 and uuid_generate_v4 data type functions by using a select statement. Select – Select is used to select the UUID data type in PostgreSQL.Primary key – We have created a primary key on the UUID column while creating a new table, we can also create a primary key later in the column.Data type – We can define different data types for the different columns while creating a table.Create – Create a keyword used to create a new table using a UUID data type on the column. ![]() We can create a UUID data type on the column.
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