Skip to main content
Super TutorResources
Chapter 9 of 13
Revision Notes

Structured Query a Language (SQL) — Revision Notes

Haryana Board · Class 12 · Computer Science

Structured Query a Language (SQL) revision notes for Haryana Board Class 12 Computer Science: 4 topics in quick points.

50 questions96 flashcards5 concepts

Interactive on Super Tutor

Studying Structured Query a Language (SQL)? Get the full interactive chapter.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for revision notes and more.

Try Super Tutor — Free

Free trial, no card needed.

A diagram illustrating how SQL interacts with various Relational Database Management Systems (RDBMS) like MySQL, Oracle, PostgreSQL, and SQL Server, showing SQL as the common language for data access
Super Tutor

One of 17 illustrations for Structured Query a Language (SQL) in Super Tutor — alongside flashcards, concept maps and practice questions.

Key Topics to Revise

1

1. SQL Basics and Data Types

  • SQL is used to access and manipulate data in a database.
  • It can define the structure of data, manipulate data, declare constraints, and retrieve data.
  • A database is a collection of related tables.
2

2. Constraints and Keys

  • NOT NULL means a column cannot store NULL values.
  • UNIQUE means all values in a column must be different.
  • DEFAULT gives a value when no value is supplied.
3

3. DDL and Table Structure Commands

  • CREATE, ALTER, and DROP are Data Definition Language statements.
  • CREATE DATABASE makes a database.
  • CREATE TABLE makes a table with columns, data types, and constraints.
4

4. DML: INSERT, UPDATE, DELETE

  • INSERT, SELECT, UPDATE, and DELETE are Data Manipulation Language statements.
  • INSERT adds new rows into a table.
  • Values for text and date fields are written in single quotes.

Get complete notes with diagrams and examples

Full Notes

Key Concepts

SQL is the most popular queryCommon MySQL data types include CHARImportant constraints include NOT NULLCREATEINSERT

Frequently Asked Questions

What are the important topics in Structured Query a Language (SQL) for Haryana Board Class 12 Computer Science?
Key topics in Structured Query a Language (SQL) include SQL Basics and Data Types, Constraints and Keys, DDL and Table Structure Commands, DML: INSERT, UPDATE, DELETE. Study these first, then practise questions on each for the Haryana Board Class 12 board exam.
How should I revise Structured Query a Language (SQL) for the Haryana Board Class 12 board exam?
Learn the core ideas first, then work through the 50 practice questions on Structured Query a Language (SQL). Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Structured Query a Language (SQL)

All Haryana Board Class 12 Computer Science Revision Notes

For serious students

Get the full Structured Query a Language (SQL) chapter — start free.

Quizzes, flashcards, an AI doubt solver and a study plan for Haryana Board Class 12 Computer Science. Free to start, no card needed.

Try Super Tutor Free
Try this chapter free