Tutorial
Posgresql how disable and renable foreign constraints forcing data into a table ignoring foreign keys (or trigger)  [PostgreSQL] 
Ordering by highest or lowest value of multiple columns PostgreSQL functions in order by clause  [PostgreSQL] 
Postgres check database is Master or Replica ways to check database replication role  [PostgreSQL] 
PostgreSQL determine database uptime   [PostgreSQL] 
Comandi
PostgreSQL enable autostart at reboot on Centos / Redhat Configure autostart after reboot  [PostgreSQL] 
PostgreSQL determine database size pg_database_size function returns database size   [PostgreSQL] 
How get PosgreSQL table size pg_total_relation_size function  [PostgreSQL] 
Grouping data by the week example date_trunc function, trimming days by the week  [PostgreSQL] 
postgres tip: how re-execute a query every n second a nice postgres shell command  [PostgreSQL] 
How set a default schema working away in your postgreSQL session  [PostgreSQL] 
Add time to a date date function operation  [PostgreSQL] 
date and timestamp simple Using date and timestamp   [PostgreSQL]