Re: Character string relation and functional dependencies

Tegiri Nenashi wrote:
> On Dec 6, 9:40 am, rp..._at_pcwin518.campus.tue.nl (rpost) wrote:

>> Another difference is that database tables are finite and variable,

I thought that computers are finite, so the relations containable in them are too - even if damn large. There's a big difference between very large and infinite.

One ultimate limitation is the uniqueness requirement. Suppose you have a table with two integer columns. Since the range of the integer types are finite (even if your DBMS handles multi-precision integers), then the maximum number of distinct rows in the relation is also finite.

-- 
Jonathan Leffler                   #include <disclaimer.h>
Email: jleffler_at_earthlink.net, jleffler_at_us.ibm.com
Guardian of DBD::Informix v2007.0914 -- http://dbi.perl.org/

publictimestamp.org/ptb/PTB-1963 whirlpool 2007-12-06 21:00:03
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