In the database programming language PASCAL/R, theprogramming language PASCAL and concepts based on therelational data model are integrated. The paperinvestigates transformation strategies used in the PASCAL/Rsystem to evaluate queries with existential and universalquantifiers. Intermediate data...

Query processing in databases can be divided into two steps:selecting an 'optimal' evaluation strategy, and executing it. We first presentelementary nested loop and relational algebra algorithms for query execution andpoint out some opportunities for improving their performance. A survey...