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What are the reasons for having variable length records? What are the various ways to store variable length records?
Variable-length records arise in a database in various ways:
(i)Storage of multiple items in a file. (ii)Record types allowing variable field size (iii)Record types allowing repeating fieldsVarious ways of storing variable length records:
(i) In fixed form through allocating every record, maximum amount of space in which can be occupied a record and padding smaller sized records along with nulls. (ii) Special separator characters among the records to delineate variable length records.
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
Write a query to define tables students and teachers as sub tables of people? Create table students of student under people Create table teachers of teacher under people
how to write tables and drow E-R diagrams for hosiptal management system and how to normalize and cardinalities?
Which is another name for weak entity? Child is another name of weak entity.
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
What is inheritance? Define it in detail? Inheritance Inheritance can be at the levels of types, or at the level of tables we first consider inheritance of types, then i
what are the main characteristics of database
What is MySQL? MySQL is a relational database management system which has eleven million installations. It can be used for both Linux and Window. Managing database includes add
Components of database manager The above functions are reached by the database manager. The major elements of a database manager are: Authorisation control: This mod
Explain Interfaces for parametric Users? Interfaces for Parametric Users - Parametric users, such as bank tellers, frequent have a little set of operations in which they must p
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