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Databases have become an integral part of the modern society. In everyday life, we encounter several activities that involve use of databases such as withdraw of money from bank, getting railway reservation tickets, issuing a book from library, etc. When database of a large application is designed, the database designer has to deal with its large sized schema. He/she faces problems related to its representation, communication, comprehension, and documentation. This thesis addresses the problem of large sized database schema prepared using Entity Relationship (ER) model and proposes two...

A Point Count System model, DRASTIC, was used to assess the groundwater pollution potential from nitrogen fertilizers in Ludhiana district of Punjab, India. Thematic maps of the seven parameters of the model i.e. depth to water table, recharge, aquifer media, soil, topography, impact of vadose zone and hydraulic conductivity were prepared in a geographic information system (GIS) environment to obtain nitrogen pollution potential indexes based on the consumption of nitrogenous fertilizers. The model was calibrated and validatedfor the region.Statistical analysis showed good agreement between...