---
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id: "66dfdea63f8b4e9e69bf7caa"
title: "Querying and SQL Functions"
board: "CBSE"
curriculum: "CBSE"
class: "Class 12"
subject: "Informatics Practices"
book: "Informatics Practices"
chapter: "Querying and SQL Functions"
chapter_slug: "querying-and-sql-functions"
canonical_url: "https://www.edzy.ai/cbse-class-12-informatics-practices-querying-and-sql-functions"
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last_updated: "2026-06-20"
---

# Querying and SQL Functions
In this chapter, we will explore advanced SQL commands essential for querying a database, including single row and multiple row functions, record arrangement, grouping, and operations on multiple tables as illustrated through the CARSHOWROOM database.

## Knowledge Snapshot
| Field | Details |
| :--- | :--- |
| Class | Class 12 |
| Subject | Informatics Practices |
| Book | Informatics Practices |
| Chapter | Querying and SQL Functions |
| Pages | 1-26 |

## Chapter Summary
### Short Summary
This chapter discusses SQL commands necessary for querying databases, focusing on functions, ordering, grouping, and multi-table operations within the CARSHOWROOM database structure.

### Detailed Summary
In this chapter, we expand on SQL knowledge acquired in Class XI, emphasizing the use of SQL functions to manage and retrieve data from the CARSHOWROOM database's four relations: INVENTORY, CUSTOMER, SALE, and EMPLOYEE. We will learn to implement single and multiple row functions, sort records, group data based on specified criteria, and use queries involving multiple tables. The schema diagram provides a visual representation of the database's structure.

## Topic-Wise Explanation
### Introduction
We will delve into SQL commands essential for effective database queries, introducing the CARSHOWROOM database.

### Functions in SQL
This topic covers single row and multiple row functions utilized in SQL for data retrieval and manipulation.

### GROUP BY in SQL
An overview of grouping records based on specific criteria to analyze data more effectively.

### Operations on Relations
Discussion on how to perform operations on various relations within the database.

### Using Two Relations in a Query
Illustrates how to execute queries that involve multiple tables in the CARSHOWROOM database.

## Core Ideas
| Idea | Explanation |
| :--- | :--- |
| Understanding SQL Functions | Essential for querying a database effectively. |
| Database Schema Structure | Key relational elements include INVENTORY, CUSTOMER, SALE, and EMPLOYEE. |

## Key Concepts
| Concept | Meaning |
| :--- | :--- |
| SQL Functions | Commands to manipulate and query data in databases. |
| GROUP BY Clause | A SQL statement used to arrange identical data into groups. |

## Important Points for Revision
* SQL commands are fundamental for querying databases.
* Single row functions operate on one row of data at a time.
* Multiple row functions can process multiple records simultaneously.
* The GROUP BY clause is crucial for aggregating data.
* Understanding the schema is important for effective data management.
* Multi-table queries enable complex data retrieval operations.
* The CARSHOWROOM database serves as a practical example.
* Familiarity with data types is essential for SQL functions.

## Vocabulary and Glossary
| Word / Phrase | Meaning |
| :--- | :--- |
| Relation | A table in a database schema containing data. |
| Query | A request for data or information from a database. |

## Practice Questions
### Short Answer Questions
1. What are SQL functions used for in this chapter?
2. Describe the purpose of the GROUP BY clause.
3. List the four relations in the CARSHOWROOM database.
4. How do single row functions differ from multiple row functions?
5. What is the significance of the schema diagram?

### Long Answer Questions
1. Explain how to use SQL functions for data manipulation within a database.
2. Describe the process of grouping records in SQL and its benefits.
3. Discuss the operations that can be performed on relations in a database and provide examples.

## Related Concepts
* SQL Commands
* Database Management
* Data Retrieval Techniques

## Source Attribution
| Field | Value |
| :--- | :--- |
| Source | Edzy |
| Reference Type | examSubjectBookChapter |
| Reference ID | 66dfdea63f8b4e9e69bf7caa |
| Canonical URL | https://www.edzy.ai/cbse-class-12-informatics-practices-querying-and-sql-functions |
| Markdown URL | https://www.edzy.ai/okf/chapter/cbse-class-12-informatics-practices-querying-and-sql-functions.md |