1. Describe the relations that would be produced by the following relational algebra operations a) ПhotelNo(σprice>100(Room)) It will produce a single attribute (hotelNo) giving the number of hotels room prices greater 100. b) σHotel.hotelNo=Room.hotelNo(Hotel X Room) A join produce of hotel and room containing all the attributes of both. c) ПhotelName(Hotel Hotel.hotelNo=Room.hotelNo (σprice>100(Room))) It is a join of hotel and room with the price greater than 100. d) Guest(σdateTo>’1-June-12’(Booking)
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What problem would you encounter if you wanted to produce a listing by city? How would you solve this problem by altering the file structure? Some of the project managers are mentioned several times‚ that would cause duplication in the city database. 3. If you wanted to produce a listing of the file contents by last name‚ area code‚ city‚ state‚ or zip code‚ how would you alter the file structure? Divide address capabilities‚ by dividing MANAGER_ADDRESS into its component parts (MGR_STREET
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supermarket of U.K‚ have to be the first minded. In Tesco’s diapers and beers are sold together on the same stands on Fridays. Diaper and beer. The reason is very simple. At weekends while English men look after their babies ‚ they watch football and while they watch football ‚they usually drink beer. There may be no other way to discover that diapers and beers are in the same basket during Friday’s shoping than data base marketing . The information ‚ about 70 % percent of people who buy stocks
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The troubles in Northern Ireland Many people only have a limited idea about what these infamous “troubles” in the North of Ireland really were. Hopefully this article will shed some light on the matter. In the past the vast majority of violent acts and attitudes of discrimination towards minority groups have been based on blacks or the Jews‚ often leaving religious wars to the olden day Europe. However according to research “ the Troubles in Northern
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Linked List July 21‚ 2009 Programming and Data Structure 1 Introduction • A linked list is a data structure which can change during execution. – Successive elements are connected by pointers. – Last element points to NULL. – It can grow or shrink in size during execution of a program. – It can be made just as long as required. – It does not waste memory space. A July 21‚ 2009 head B Programming and Data Structure C 2 • Keeping track of a linked list: – Must know the
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Mobile Database Systems [ 1 ] Jerri Scott Technical Essay #1 Mobile Database Systems MGT – 5151 Database Systems Management November 7‚ 2010 [ 2 ] Due to the increasing utilization of mobile networks and devices‚ mobile database systems have become a prominent method of data access. Data maintenance becomes a necessity for users who require mobility. Therefore‚ the usage of mobile database systems provides a convenient way of data creation‚ collection and management through mobile
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Senior Troubles Since I have been a senior‚ I have been through a lot of troubles through out my year so far. I am constantly doing work to make sure I pass senior year‚ I’m trying to set myself up for college‚ and I’m most of all worried what I want to do with my future. There is a saying‚ “your senior year will be the easiest year you will have in high school”. It’s really not; it is the hardest year you will have in my opinion. I am trying to pass my senior year and to do that I need to make
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List of Connectors 1. Linking words for essays‚ reports‚ papers listing firstly‚ secondly ... to begin / start with ...‚ to conclude with in the first place‚ in the second place next ‚ then ‚ finally‚ last(ly) to conclude ... last but not least ... to summarise ‚ to sum up adding also‚ too‚ then furthermore ... moreover ... in addition to that ... above all ...... what is more ... additionally comparing equally‚ likewise‚ similarly‚ in the same / a different way compared to
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DATABASE SPECIFICATIONS 1. TABLE NAME : TBLGENDER FIELD NAME DATA TYPE SIZE CONSTRAINT REFERENCES GID IntN/A PK‚ IDENTITY NONE GDESC Varchar6 NOT NULL NONE 2. TABLE NAME: TBLGRDLVL FIELD NAME DATA TYPE SIZE CONSTRAINT REFERENCES GRDID IntN/A PRIMARY KEY‚IDENTITY NONE GRDLVLDESC VarChar15 NOT NULL NONE GRDSECTION Varchar15 NOT NULL NONE 3. TABLE NAME: TBLRANK FIELD NAME DATA TYPE SIZE CONSTRAINT REFERENCES RANKID IntN/A PRIMARY KEY‚IDENTITY NONE RANKDESC Varchar20 NOT NULL NONE 4.
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Database Project #1: Grocery Store Database DatabaseName: GroupStoreProject Project Description Today‚ there are many grocery store and grocery list apps on the market. Our task was to exercise our creativity and create a relational database to support a grocery list website for a corresponding application. First‚ we created the data model containing entities named Category‚ Chain‚ List‚ List_Item‚ Product‚ Section‚ Shelf‚ Shelf_Inventory‚ Shopper‚ Shopper_List‚ Store‚ and Store_Inventory.
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