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The Internal or Physical Level
The collection of files permanently stored on secondary storage devices is called as the physical database. The internal or physical level is the one nearby to physical storage, and it gives a low-level description of the physical database, and an interface among the operating systems file system and the record structures used in higher levels of abstraction. It is at the level that record types and methods of storage are definite, as well as how stored fields are shown, what physical sequence the stored records are in, and what other physical structures exist.
How to Insert data in your table from another table? insert into e.g, To insert tuples from employee into N_emp created above, use following statement Insert into N_emp
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Consistency: This property makes sure that a complete transaction implementation takes a database from one consistent state to another consistent state. If the transaction fails e
Consider the relations given below Borrower (id_no, name) Book (accno., title, author, borrower_idno) (a) Define the above relations as tables in SQL forming real world assumptio
Describe an data dictionary? A data dictionary is a data structure which keeps meta data about the structure of the database ie. the schema of the database.
Un-Normalized Form (UNF) If a table having non-atomic values at every row, it is said to be in UNF. An atomic value is something that cannot be further decomposed. A non-atomic
What is nested relational model? The nested relational model is an extension of relational model in which domains might be either atomic or relation valued.
define anomalies and different types of anomalies with example
Question 1 Explain the concept of Foreign Key. How a foreign key differs from a Primary Key? Can the Foreign Key accept nulls? Question 2 With a necessary example explain (i)
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