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Explain Relational model and their use in DBMS?
Relational Model - The relational model was first introduced through E.F. Codd of the IBM Research in the year of 1970. The model uses the concept of a mathematical relation (like a table of values) as its primary building block, and has its theoretical basis in set theory and first-order predicate logic. The relational model presents the database as a collection of relations.
why we fregment at all?
Write short notes on transaction state? A transaction may not always complete its implementation successfully such a transaction is termed aborted A transaction must be in o
What does conceptual design work? A conceptual design involves modelling independent of the DBMS.
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
How can you Start MySQL Server? To start the mysql program type it is name in the command- line prompt. After starting mysql program just display A welcome letter using the
What is the full form of ODBC ? ODBC stands for Open Database Connectivity.
Describe the definition of a transaction in SQL Ans: The SQL transaction starts implicitly. Transactions are finished by either Commit work that commits the transaction and st
#explain five disadvantages of a dbms..
What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
What do you mean through integrity constraints? Integrity Constraints -An integrity constraint is a condition specified on a database schema and restricts the data in which
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