Show databases :
postgresql: \l
postgresql: SELECT datname FROM pg_database;
Show tables :
postgresql: \d
postgresql: SELECT table_name FROM information_schema.tables WHERE table_schema = 'public';
Show table columns :
postgresql: \d table
postgresql: SELECT column_name FROM information_schema.columns WHERE table_name ='table';
SELECT and COUNT in same query :
postgresql: SELECT "ddd_type_flux", count(*) AS "count"
FROM "ddd_demande" WHERE 1 = 1 GROUP BY "ddd_type_flux" ORDER BY "count";