postgres=# insert into users (userid) values(gen_random_uuid());
INSERT 0 1
postgres=# select gen_random_uuid();
           gen_random_uuid            
--------------------------------------
 56b61ada-789d-4aea-ade4-04fdd66c5ea0
(1 row)

postgres=# insert into users (userid)  values('56b61ada-789d-4aea-ade4-04fdd66c5ea0');
INSERT 0 1
postgres=# select * from users;
                userid                | username 
--------------------------------------+----------
 bacba28a-7b45-4bf1-96b7-1ddd5cd50745 | 
 56b61ada-789d-4aea-ade4-04fdd66c5ea0 | 
(2 rows)
复制