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Querying and SQL Functions

CBSE · Class 12 · Informatics Practices

Step-by-step guide to study Querying and SQL Functions in CBSE Class 12 Informatics Practices. Topics to cover, practice strategy, and time allocation.

111 questions84 flashcards5 concepts

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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas, and key concepts.

2
Day 3

Practice Problems

Solve textbook exercises and additional practice questions. There are 111 questions available for this chapter.

3
Day 4

Revise & Test

Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.

4
Day 7

Spaced Revision

Revisit Querying and SQL Functions after a week. Use flashcards for quick recall. Solve previous year questions from this chapter.

What to Focus On

  • CARSHOWROOM contains INVENTORY, CUSTOMER, SALE, and EMPLOYEE.
  • INVENTORY uses CarId as primary key.
  • CUSTOMER uses CustId as primary key.

  • Single row functions are scalar functions.
  • Aggregate functions are multiple row functions.
  • Single row functions can appear in SELECT, WHERE, and ORDER BY.

  • POWER(X,Y) and POW(X,Y) are the same function.
  • ROUND(N,D) rounds a number to D decimal places.
  • If D = 0, ROUND gives the nearest integer.

Common Mistakes to Avoid

COUNT(column) and COUNT(*) always give the same result.

WHERE can be used to filter grouped results after GROUP BY.

Aggregate functions can be used in WHERE, ORDER BY, and SELECT in the same way as single row functions.

Memory Tips

SQL function categories

Single row functions are also called scalar functions

Math, string, and date and time functions

POWER and POW

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Frequently Asked Questions

What are the important topics in Querying and SQL Functions for CBSE Class 12 Informatics Practices?
Querying and SQL Functions covers several key topics that are frequently asked in CBSE Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Querying and SQL Functions — CBSE Class 12 Informatics Practices?
Understand the core concepts first, then work through the 111 practice questions available for this chapter. Revise formulas and 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.

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