Database Theory Victor Vianu Column University of California San Diego vianu@cs.ucsd.edu T h e last d a t a b a s e t h e o r y c o l u m n i n i t i a t e d a series of articles on t h e r e l a t i o n s h i p b e t w e e n d a t a b a s e t h e o r y and p r a c t i c e w i t h a guest c o l u m n by D a v i d Harel: Will I be Pretty, Will I be R i c h ? - S o m e Thoughts on Theory vs. Practice in S y s t e m s Engineering. We c o n t i n u e w i t h an article by Christos H. P a p a d i m i t r i o u , based on his i n v i t e d t a l k at P O D S '95. Database Metatheory:
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