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Define- relational algebra.
The relational algebra is a procedural query language. It having of a set of operations that take one or two relation as input and make a new relation as output.
What is conceptual model ? A conceptual model is a independent of both hardware and software.
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write-set(T): Each data items that are written by a transaction T
Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
what is object-identity
write short note on mobile database
comparison of oracle RDBMS with MySQL
Limitations of File Based System The file-based system has some limitations. The limitations are listed as follows: Isolation and separation of data: When the data is
Use Access 2007 to create a database called UniLib.mdb. - this file should be created on your personal drive at the university (or C: if you're using Access 2007 at home) and t
Given the following relations TRAIN (NAME, START, DEST) TICKET (PNRNO., START, DEST, FARE) PASSENGER (NAME, ADDRESS, PNRNO.) Write SQL expressions for the following queries: No
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