Information Technology · Class 12 Commerce
Ch 5Database Concepts using LibreOffice Base — Class 12 Information Technology, concept-first.
In an earlier stage of this Maharashtra HSC (MSBSHSE) Std XII Information Technology course you learned what a database is and why organisations store their data in an organised, structured form rather than in scattered files.
Key concepts
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LibreOffice Base and Database Objects
LibreOffice Base is the free, open-source database component of the LibreOffice suite. It stores an entire relational database in a single .odb file and lets you build four kinds of object: tables (which store the data i…
Most relevant Q&A
Chapter contents
The NCERT structure, section by section. Open a section to see its questions, then read the concept-first solution.
Introduction to LibreOffice Base
In an earlier stage of this Maharashtra HSC (MSBSHSE) Std XII Information Technology course you learned what a database is and why organisations store their data in an organised, structured form rathe…
Creating Tables and Choosing Fields
A table is the object in which a LibreOffice Base database actually stores its data, arranged in rows (records) and columns (fields).
Data Types and Field Properties
When you create a field, you must give it a data type — a rule that fixes what kind of value the field can hold.
Primary Keys and Relationships
A primary key is a field (or a combination of fields) whose value uniquely identifies each record in a table.
Queries — Using the Query Designer
A query is a question you ask of the database to retrieve exactly the records you want — for example, 'show all customers from Pune' or 'list orders above ₹5,000'.
Queries Using SQL — SELECT, WHERE and ORDER BY
SQL (Structured Query Language) is the standard language for working with relational databases. In LibreOffice Base you can run SQL directly by opening Create Query in SQL View...
Forms and Reports
Typing data straight into a table's grid works, but it is not friendly for everyday users, and a raw table is not the nicest way to present results.
Exercises
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- Q1What is LibreOffice Base? State any two features of it.Free
- Q2Name the four main objects of a LibreOffice Base database and state the purpose of each in one line.Free
- Q3What is a data type? Name any four data types available in LibreOffice Base and give an example use of each.Free
- Q4Explain any three field properties that can be set for a field in LibreOffice Base.Preview
- Q5What is a primary key? How is a primary key set for a table in LibreOffice Base?Preview
- Q6Distinguish between a primary key and a foreign key, and explain how a foreign key creates a relationship between two tables with an example…Preview
- Q7What is a query? Explain briefly how a query is created using the Query Designer (Design View) in LibreOffice Base.Preview
- Q12Distinguish between a form and a report in LibreOffice Base.Preview
- Q13Multiple choice: In LibreOffice Base, which object is used to enter and edit data one record at a time through a user-friendly window? (a) T…Preview
- Q14State whether the following statement is True or False and justify: 'A foreign key must always match a primary key value in the related tabl…Preview
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- Example 8Write an SQL statement to create a table named 'Customer' with the fields CustID (whole number, primary key), Name (text up to 40 characters…Free
- Example 9Write an SQL query to display the Name and City of all customers who live in 'Pune' from the Customer table.Free
- Example 10Write an SQL query to display the Name and Marks of all students, arranged in descending order of Marks, from the Student table.Preview
- Example 11Write an SQL query to display the OrderNo and Amount of all orders above 5000 that belong to the customer whose CustID is 3, from the Orders…Preview