?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=https%3A%2F%2Fpure.iiasa.ac.at%2Fid%2Feprint%2F4193%2F&rft.title=On+Integrity+Constraints+for+a+Waste+Management+Information+System&rft.creator=Schreiber%2C+D.&rft.description=There+is+a+waste+problem+in+nearly+every+country.+A+model+of+a+waste+generating+system+and+an+efficient+waste+management+information+system+are+the+first+steps+to+control+this+problem.+Some+countries+have+already+enacted+laws+which+force+communities+and+enterprises+to+report+annually+the+amounts+of+wastes+produced.+For+example%2C+the+German+federal+state%2C+Lower+Saxony%2C+enacted+such+a+law+in+1992.+This+YSSP-Project+deals+with+a+case+study+on+the+development+of+a+waste+management+information+system+for+this+state.+The+quality+of+the+system+essentially+depends+on+the+consistency+of+the+underlying+database+system.+Therefore%2C+the+point+of+view+of+a+database+designer+is+given.+The+design+of+the+data+structures+and+the+support+of+integrity+constraints+in+the+underlying+database+system+is+thereby+especially+emphasized.+The+data+structures+are+modelled+using+an+extended+entity+relationship+model.+They+are+implemented+with+a+relational+database+management+system.+In+contrast+to+the+traditional+way+of+supporting+integrity+constraints+in+the+application+program%2C+we+define+triggers+which+are+implemented+in+the+database+system+itself+to+enforce+main+consistency+rules.+In+the+final+chapter+some+conclusions+about+further+steps+are+given.&rft.publisher=WP-94-016&rft.date=1994-03&rft.type=Monograph&rft.type=NonPeerReviewed&rft.format=text&rft.language=en&rft.identifier=https%3A%2F%2Fpure.iiasa.ac.at%2Fid%2Feprint%2F4193%2F1%2FWP-94-016.pdf&rft.identifier=++Schreiber%2C+D.+%3Chttps%3A%2F%2Fpure.iiasa.ac.at%2Fview%2Fiiasa%2F2367.html%3E++(1994).++On+Integrity+Constraints+for+a+Waste+Management+Information+System.+++IIASA+Working+Paper.+IIASA%2C+Laxenburg%2C+Austria%3A+WP-94-016+++++