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SQL Interview Questions – Basics 1

What is RDBMS (Relational database management system)?

RDBMS is a database management system (DBMS) that is based on the relational model. Relationships may be created and maintained across and among the data and tables. In a relational database, relationships between data items are expressed by means of tables. Interdependencies among these tables are expressed by data values

What is the Difference between DBMS and RDBMS?

A DBMS has to be persistent, that is it should be accessible when the program created the data ceases to exist or even the application that created the data restarted. A DBMS also has to provide some uniform methods independent of a specific application for accessing the information that is stored.

RDBMS is a Relational Data Base Management System Relational DBMS. This adds the additional condition that the system supports a tabular structure for the data, with enforced relationships between the tables. This excludes the databases that don’t support a tabular structure or don’t enforce relationships between tables.

 What are the properties of the RDBMS tables?

1         Values are atomic.

2         Column values are of the same kind.

3         Each row is unique.

4          Each column must have a unique name.

5         The sequence of columns is insignificant.

6         The sequence of rows is insignificant.

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