00470nam 2216625 450000100060000000300230000600500090002900800410003808200100007907200370008910000180012626000280014424500220017265000370019465000210023165000500025216625StarLibrary Marc Built20180430201711 ||||| |||||||||||amh  a001.6 aintroducing relational databases aMartin Gruber bBPB PUBLICATIONS c1990 aunderstanding sql aintroducing relational databases asql: an overview ausing sql to retrieve information from tables