nicht angemeldet
Achso, und ich hätte hier auch noch einen entsprechenden Blog-Eintrag.
...und einen Artikel
...und das RedHat-Database-SQL-Manual
-> Essenz: NULL-Werte basieren auf einer 3-wertigen Logik von TRUE, FALSE und UNKNOWN, wobei UNKNOWN und NULL mal in die eine, mal in die andere Richtung gleichbedeutend implementiert werden.
Oracle legt sehr viel Wert auf den kleinen Unterschied und widerspricht mir insofern, als dass das Ergebnis eines Vergleiches mit NULL entsprechend dem gerade gesagten nicht NULL sondern UNKNOWN ist.
MfG
Rouven
--
-------------------
He is entertaining both out of the car and in the car because if you tell him that a corner is almost flat then he is the guy who is going to try to take it flat even if it means shunting it the other side of it, he will come with the data and say 'hey, I may have crashed and destroyed the car, but I was flat-out'. That is an interesting quality that he has! -- Team Member on Jacques Villeneuve
-------------------
He is entertaining both out of the car and in the car because if you tell him that a corner is almost flat then he is the guy who is going to try to take it flat even if it means shunting it the other side of it, he will come with the data and say 'hey, I may have crashed and destroyed the car, but I was flat-out'. That is an interesting quality that he has! -- Team Member on Jacques Villeneuve