Sample location for pg_hba.conf: /etc/postgresql/9.1/main/pg_hba. Safely (though SSL certificate authentication might be a better choice If theĬonnection is protected by SSL encryption then password can be used However, md5 cannot be used with the db_user_namespace feature. Plain password should always be avoided if possible. If you are at all concerned about password "sniffing" attacks then md5 Methods operate similarly except for the way that the password is sentĪcross the connection, namely MD5-hashed and clear-text respectively. The password-based authentication methods are md5 and password. Operating system user name from the kernel and using it as the allowedĭatabase user name (with optional user name mapping). The peer authentication method works by obtaining the client's These are brief descriptions of both options according to the official PostgreSQL docs on authentication methods. Now, when discount is NULL it gets replaced by the default value 0, ensuring that the calculation proceeds smoothly. If you're on Linux, that would be sudo service postgresql restart. finalprice now contains the expected data. The command locate pg_hba.conf should help here's some examples: /etc/postgresql/*/main/pg_hba.conf and /var/lib/pgsql/data/pg_hba.conf.Īfter altering this file, don't forget to restart your PostgreSQL server. The statement below returns 0 if the value is NULL. * The location of this file isn't very consistent. The PostgreSQL COALESCE() function lets you to provide an alternative value if column value is NULL. The problem is still your pg_hba.conf file*.
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