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explain various steps uses in evaluation and maintenance of MIS.
Define According to the levels of abstraction, the schema at the intermediate level is called Ans: As per to the levels of abstraction, the schema at the intermediate level is
what problems are raised by the database? why is it so controversial? why is data quality an issue?
What is Relational Algebra? Relational algebra is a Procedural query Language?
Need a sample of a clinic database relationships
What is transaction? Collections of operations that form a single logical unit of work are known as transactions.
what is union compatable?
What's the difference between a primary key and a unique key? Both primary key and unique key enforces uniqueness of the column on which they are explained. But by default prim
How are tables stored on Disk? We realise that every record of a table can have different amounts of data. This is due to in some records; some attribute values may be "zero".
What does data dictionary is a special file contains ? The data dictionary is a special file contain The name of all fields in all files.The width of all fields in all files an
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