Re: a problem about database modeling

> i list my sql code here table device: CREATE TABLE `equ` ( ....

There is no simple, normalized and NULL-less solution to your problem with a RMDB. If you could post some actual data, I can show how dbd handles it and one of the RM experts can design a schema that meets your needs. What exactly are you needs? Are you trying to avoid NULLs and or redundant data or more than X number of tables? Received on Thu Jul 20 2006 - 16:10:45 CEST