Week 7 & 8

   Well, Deepavali came and just went away in a snap. There was a test on Sunday and yeah we're done with celebration and went through the notes.Done with the test and I used up a lot of entities which were given there and draw my ERD .Hopefully its all taken care of well. I didnt know if im doing the correct thing but i know half of it was eventually correct. So i decided not to change my answers and go on with it.

    Now we have gone to a new chapter which was about Relational Algebra. Relational algebra is a procedural query language, which takes instances of relations as input and yields instances of relations as output. It uses operators to perform queries. An operator can be either unary or binary.

   This topic uses symbol like projection,selection,cross product,set-difference and union to modify the data given. The symbols are quite known and it was easy for us to remember. According to the lab session, it was not that tough as i thought. She gave us exercises and taught us how to do it. After doing it, we can just submit to her by mail or wikispace. We do not need to crack our mind because Miss Halimah was always there to help us in many ways. The exercises for relational algebra was just perfect enough to move on.