GATE-CS-2017 (Set 2) - Chapter 42

This GATE-CS-2017 (Set 2) paper refers to Chapter 42 of the syllabus which pertains to database management systems and SQL programming. As a programmer, understanding database management and SQL programming is crucial for building scalable applications.

Database Management Systems

Database management systems (DBMS) are software applications used to create, store, manipulate, and retrieve data from databases. The primary objective of a DBMS is to provide a way to store and retrieve large amounts of data efficiently and securely.

Popular DBMS include Oracle, Microsoft SQL Server, MySQL, and PostgreSQL.

SQL Programming

SQL (Structured Query Language) is a domain-specific programming language used to manage and manipulate relational databases. It is used to create, modify, and query databases and their tables.

SQL can be used to perform data manipulation, data definition, and data control operations. Data manipulation operations include retrieving, inserting, updating, and deleting data in a database. Data definition operations include creating and modifying the structure of a database and its tables. Data control operations include managing user access to a database and enforcing data security policies.

Here is an example of a SQL statement that creates a new table named "employees":

CREATE TABLE employees (
    id INT NOT NULL,
    name VARCHAR(50) NOT NULL,
    age INT,
    salary DECIMAL(10,2),
    PRIMARY KEY (id)
);

Conclusion

In conclusion, understanding database management systems and SQL programming is crucial for building scalable and robust applications. As a programmer, you should be proficient in using DBMS software and SQL programming to manipulate data effectively.