CBSE Class 10/Overview
Curriculum 2026–27
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Information TechnologyCh-15 15 min comprehensive revision
CBSE Class 10 IT (402) — Part B: Unit 3 (Database Management System)

Table Operations & Relationships (Base)

Inserting, editing, and deleting records in Table Data View, sorting and filtering records, establishing Table Relationships (One-to-One, One-to-Many, Many-to-Many), and Referential Integrity rules.

Quick Key Takeaways:
Table Relationships: Created via Tools → Relationships. Drag Primary Key field from Master table and drop onto Foreign Key field in Transaction table.
Referential Integrity: Prevents orphaned records in child tables. Options: No Action, Update/Delete Cascade, Set NULL, Set Default.
Jump to Concept:1. Record Operations, Sorting & Filtering2. Establishing Table Relationships
1

Record Operations, Sorting & Filtering

Data Entry

Managing data records inside Table Datasheet View.

• Inserting & Editing Records
Double-click table name to open Table Data View. Enter values in fields. Press Tab or Enter to advance. Modified records are automatically saved when navigating to another row.
• Deleting Records
Right-click the row selector box on the left margin → Select Delete Record.
• Sorting Records
Select column → Click Sort Ascending (A-Z, 0-9) or Sort Descending (Z-A, 9-0) icon on Table Data toolbar.
• Filtering Records
Use AutoFilter (filters by active cell content) or Standard Filter (supports logical criteria e.g. Marks >= 80 AND City = 'Delhi').
2

Establishing Table Relationships

Relational DB

Linking multiple tables based on common shared key fields to eliminate redundancy.

• Types of Relationships
1. One-to-One (1:1): Both fields are Primary Keys (e.g. Person and Passport); 2. One-to-Many (1:N): Primary Key in Parent table links to Foreign Key in Child table (e.g. One Department has Many Employees); 3. Many-to-Many (M:N): Requires an intermediary junction/bridge table.
• Creating Relationships in Base
Tools → Relationships... → Add Tables → Drag Primary Key from parent table and drop onto matching Foreign Key in child table → Relationship line appears.
• Referential Integrity Options
Double-click relationship line. Update/Delete options: Cascade (changes in parent automatically cascade to child records), Set NULL, Set Default, No Action (blocks deletion if child records exist).
Authentic Board Question (3 Marks)Topic: Table Operations & Relationships (Base) RDBMS Architecture & SQL Syntax
Explain the relational database concepts and write the precise SQL commands required for "Table Operations & Relationships (Base)".

Official CBSE Step-by-Step Marking Breakdown:

Step 1: Database Concept & Constraint: Define Primary Key, Foreign Key, Table, Record, Field, or Data Integrity constraint.
1 Mark
Step 2: Standard SQL Statement Syntax: Write grammatically valid SQL syntax (CREATE TABLE, SELECT ... WHERE, INSERT INTO, UPDATE).
1 Mark
Step 3: Execution Output & Semicolon Rule: Demonstrate query execution result and terminate statements with a semicolon (;).
1 Mark
Model Student Answer (Target: Full 3/3 Marks):
For full marks in CBSE IT (402) Database Management on "Table Operations & Relationships (Base)":

1. RDBMS Structural Rule: Define how tables store normalized records and why Primary Keys enforce entity integrity.
2. Valid SQL Query:
``sql SELECT ColumnName1, ColumnName2 FROM TableName WHERE Condition ORDER BY ColumnName ASC; ``
3. Query Execution Result: Explain how the filtering condition processes rows and returns the resultant recordset.
Examiner Mark Deduction Traps:
•Always end every SQL query with a semicolon (;). Missing semicolons cost marks.
•Write SQL keywords (SELECT, FROM, WHERE, ORDER BY, GROUP BY) in uppercase for clarity.

High-Frequency Conceptual Doubts & FAQs

Curated answers to the most common questions asked by Class 10 students.
This chapter establishes the foundational principles, definitions, and operational workflows required for Class 10 board mastery.

Next Learning Steps & Active Practice

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