PostgreSQL is a public domain SQL database. One table holds the username and the encrypted password. The other table holds the username and the names of the group to which the user belongs. It is possible to have username, groupname and password in the same table. Refer to the Postgres95 user manual for a description of the available options.
Extension Gives the name of the relation which contains the username and password information.
Extension Gives the name of the relation which contains the username and group information. This directive is only necessary if you want to authenticate by user groups. This directive is only necessary if you want to authenticate by user groups. This option is off by default. Turning it on will cause a user to be validated when their password field is empty.