PostgreSQL
\
commands
\d - list tables, views, and sequences
Como listar todas as tabelas do banco
SELECT
*
FROM
pg_catalog.pg_tables
WHERE
schemaname != 'pg_catalog'
AND schemaname != 'information_schema'
;
Como apagar todas as tabelas do banco ⚠️
DROP SCHEMA public CASCADE;
CREATE SCHEMA public;
Remover todos caracteres que não são letras
regexp_replace(value, '[^A-z ]+', '', 'g')
Criar uma função PL/pgSQL
CREATE OR REPLACE FUNCTION even_odds(max int)
RETURNS int[][]
LANGUAGE plpgsql
AS $function$
DECLARE
evens int[] := Array[]::int[];
odds int[] := Array[]::int[];
BEGIN
FOR n IN 1..max loop
IF n % 2 = 0 then
evens := ARRAY_APPEND(evens, n);
ELSE
odds := ARRAY_APPEND(odds, n);
END IF;
END LOOP;
RETURN Array[evens, odds];
END;
$function$
;
SELECT even_odds(100);