SQL Server UNIQUEIDENTIFIER data type stores Universally Unique Identifiers (UUID) or GUID data. In PostgreSQL you can use UUID data type.
SQL Server:
-- Sample table CREATE TABLE specs ( data UNIQUEIDENTIFIER ); -- Inserting sample value INSERT INTO specs VALUES ('7F9619FF-8B86-D011-B42D-00C04FC964FF');
PostgreSQL:
-- Sample table CREATE TABLE specs ( data UUID ); -- Inserting sample value INSERT INTO specs VALUES ('7F9619FF-8B86-D011-B42D-00C04FC964FF');
For more information, see SQL Server to PostgreSQL Migration.