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Assignment #1 Data Management The questions on this exam are based on the Baxter Aviation case scenario. 1. (5 points) The systems analyst proposes the following two relationshi
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
Give the two reasons for allowing concurrency
coventions for displaying an ER schema as ER diagram
What are the aggregate objects in the data dictionary? Views Match codes Lock objects.
What are the properties in a relation ? In a relation Ordering of rows is immaterial and No two rows are identical.
What is the max. no. Of structures that can be included in a table or structure. Nine.
What is the disadvantage of a call by reference? During a call by reference damage or loss of data is not restricted to the subroutine, but will instantly lead to alters to th
Define Query by Example QBE is a query language relies upon domain calculus and has two dimensional syntax. The queries are written in the horizontal and vertical dimensions of
Define the Third Normal Form: The third normal form (3NF) is a normal form employed in database normalization. 3NF was initially defined by E.F. Codd in 1971. Codd's definitio
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