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What is a SELECT operation?
The select operation selects tuples that please a given predicate. We use the lowercase letter σ to denote selection.
What is the difference between SQL Server 2000 clustered and nonclustered indexes? With a clustered index, the data are kept in the bottom level of the index and in the similar
Your friend owns a computer store in Yuen Long, selling Desktop and Notebook PCs and other computer peripherals. Having been rather successful with his business there, he decided t
explain in details about one to one binary relationship
triggering
i am required to come up with entities relationships, optionality and cardinality from a scenario. there is a night club and bookings for a musician band
Consider a research paper submission process. The process starts when an author submits a draft research paper (the paper may have up to 3 authors) to the chair of the organizing c
Mappings between Levels and Data Independence The 3 levels of abstraction in the database do not exist separately of each other. There must be some correspondence, or mapping
what are the main characteristics of database
A B-tree of order how much children m has maximum ? m has maximum m mchildren in a B tree.
brief history,definition,current trends and future trends if any of data fragmentation
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