I´m interesting in learning Postgre because I´m working with it now, if you can, i want to know wich are the system tables, and in wich of them can I find a table with all of the tables, and constrants. Thanks, Adriano Gaspar. No iBest, suas horas navegadas valem pontos que podem ser trocados por prêmios. Sem sorteio! Inscreva-se já! www.navegueeganhe.com.br ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match