SQL (Structured Query Language)
SQL (Structured Query Language) is a useful educational term for students, parents, and readers who want a quick meaning in simple language.
This glossary entry explains the term in a study-friendly way so it can be used while reading textbooks, solving questions, preparing notes, or understanding classroom discussions.
To remember the term, connect it with an example, write one sentence using it, and revise it with related concepts. Clear vocabulary improves comprehension across subjects and helps students answer questions more confidently.
SQL (Structured Query Language): Explanation, Formulae and Practice
These topics connect maths with money decisions. Always identify cost price, selling price, principal, rate and time before using a formula.
Practical Formulae
- Profit = selling price - cost price.
- Loss = cost price - selling price.
- Profit percentage = (profit / cost price) x 100.
- Simple interest = (principal x rate x time) / 100.
- Amount = principal + interest.
Solved Example
Question: An item is bought for Rs. 500 and sold for Rs. 575. Find the profit percentage.
Working: Profit = 575 - 500 = 75. Profit percentage = (75 / 500) x 100.
Result: Profit percentage = 15%.
Unanswered Practice Questions
Try these yourself before checking notes or calculators.
- Find the loss percentage when CP is Rs. 800 and SP is Rs. 720.
- Find simple interest on Rs. 5,000 at 8% per year for 2 years.
- A shopkeeper marks an item at Rs. 1,200 and gives 10% discount. Find the selling price.
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