Thanks for your answer.
Now, I need that the query shows me all records of table1 , have or not linked records in table2 or table3.
For example :


table1.id table1.nombre table2.desc table3.id
---------------------------------------------------------
1 Pedro casa 1001
1 Pedro auto 1001
2 Juan casa 1003
2 Juan yate 1003
3 Alberto auto 1005
3 Alberto casa 1005
4 Luis casa
5 Hugo
6 Miguel yate 1009
7 Andres
8 Carlos casa 1017