Class 12 DBMS and Structured Query Language Revision Notes

Computer Science
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Read and download the Class 12 DBMS and Structured Query Language Revision Notes. Designed for 2025-26, this advanced study material provides Class 12 Computer Science students with detailed revision notes, sure-shot questions, and detailed answers. Prepared by expert teachers and they follow the latest CBSE, NCERT, and KVS guidelines to ensure you get best scores.

Advanced Study Material for Class 12 Computer Science DBMS and Structured Query Language

To achieve a high score in Computer Science, students must go beyond standard textbooks. This Class 12 DBMS and Structured Query Language study material includes conceptual summaries and solved practice questions to improve you understanding.

Class 12 Computer Science DBMS and Structured Query Language Notes and Questions

♦ Basic Database Concepts

Data : Raw facts and figures which are useful to an organization. We cannot take decisions on the basis of data.
Information: Well processed data is called information. We can take decisions on the basis of information
Field: Set of characters that represents specific data element.
Record: Collection of fields is called a record. A record can have fields of different data types.
File: Collection of similar types of records is called a file.
Table: Collection of rows and columns that contains useful data/information is called a table. A table generally refers to the passive entity which is kept in secondary storage device.
Relation: Relation (collection of rows and columns) generally refers to an active entity on which we can perform various operations.
Database: Collection of logically related data along with its description is termed as database.
Tuple: A row in a relation is called a tuple.
Attribute: A column in a relation is called an attribute. It is also termed as field or data item.
Degree: Number of attributes in a relation is called degree of a relation.
Cardinality: Number of tuples in a relation is called cardinality of a relation.
Primary Key: Primary key is a key that can uniquely identifies the records/tuples in a relation. This key can never be duplicated and NULL.
Foreign Key: Non key attribute of a table acting as primary key in some other table is known as Foreign Key in its current table. This key is used to enforce referential integrity in RDBMS.
Candidate Key: Attributes of a table which can serve as a primary key are called candidate key.
Alternate Key: All the candidate keys other than the primary keys of a relation are alternate keys for a relation.
DBA: Data Base Administrator is a person (manager) that is responsible for defining the data base schema, setting security features in database, ensuring proper functioning of the data bases etc.
Select Operation: The select operation selects tuples from a relation which satisfy a given condition.
It is denoted by lowercase Greek Letter σ (sigma).
Project Operation: The project operation selects columns from a relation which satisfy a given condition.
It is denoted by lowercase Greek Letter π (pi). It can be thought of as picking a sub set of all available columns.
Union Operation: The union (denoted as ∪) of a collection of relations is the set of all distinct tuples in the collection. It is a binary operation that needs two relations.
Set Difference Operation: This is denoted by – (minus) and is a binary operation. It results in a set of tuples that are in one relation but not in another
 
 Structured Query Language

SQL is a non procedural language that is used to create, manipulate and process the databases(relations).
 
1. Data Definition Language (DDL)
DDL contains commands that are used to create the tables, databases, indexes, views, sequences and synonyms etc.
e.g: Create table, create view, create index, alter table etc.
 
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Important Practice Resources for Class 12 Computer Science

CBSE Class 12 Computer Science DBMS and Structured Query Language Study Material

Students can find all the important study material for DBMS and Structured Query Language on this page. This collection includes detailed notes, Mind Maps for quick revision, and Sure Shot Questions that will come in your CBSE exams. This material has been strictly prepared on the latest 2026 syllabus for Class 12 Computer Science. Our expert teachers always suggest you to use these tools daily to make your learning easier and faster.

DBMS and Structured Query Language Expert Notes & Solved Exam Questions

Our teachers have used the latest official NCERT book for Class 12 Computer Science to prepare these study material. We have included previous year examination questions and also step-by-step solutions to help you understand the marking scheme too. After reading the above chapter notes and solved questions also solve the practice problems and then compare your work with our NCERT solutions for Class 12 Computer Science.

Complete Revision for Computer Science

To get the best marks in your Class 12 exams you should use Computer Science Sample Papers along with these chapter notes. Daily practicing with our online MCQ Tests for DBMS and Structured Query Language will also help you improve your speed and accuracy. All the study material provided on studiestoday.com is free and updated regularly to help Class 12 students stay ahead in their studies and feel confident during their school tests.

What is included in the advanced study material for Class 12 Computer Science Chapter DBMS and Structured Query Language?

Our advanced study package for Chapter DBMS and Structured Query Language includes detailed concepts, diagrams, Mind Maps, and explanation of complex topics to ensure Class 12 students learn as per syllabus for 2026 exams.

How do Mind Maps for Computer Science Chapter DBMS and Structured Query Language help in revision?

The Mind Maps provided for Chapter DBMS and Structured Query Language act as visual anchors which will help faster recall during high-pressure exams.

Are these Computer Science resources suitable for both classroom teaching and self-study?

Yes, teachers use our Class 12 Computer Science resources for lesson planning as they are in simple language and have lot of solved examples.

Is this advanced study material for Chapter DBMS and Structured Query Language free to download in PDF?

Yes, You can download the complete, mobile-friendly PDF of the Computer Science Chapter DBMS and Structured Query Language advanced resources for free.

Does this material cover rationalized content for the 2025-26 CBSE session?

Yes, our subject matter experts have updated the Chapter DBMS and Structured Query Language material to align with the rationalized NCERT textbooks and have removed deleted topics and added new competency-based questions.