About Null Values ...

Hi all, What is your strategy about null values ? Do you have columns keys that may accept null values ?. If so, do you save blanks ? There is a big problem with null values in columns-keys: If you have to join them with another table, it doesn't go .. . But sometimes is necessary null keys !!, especially in complexes colunns keys ... What do you do ? --- Ciao, Manel ----------------------------------------------------- SEMIC, S.A. Lleida (Catalunya) Spain ----------------------------------------------------- Informix version: Informix SE 5.07 / RDS 4.x Operating system: Unix SCO V 5.04