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Most Asked SQL Interview Questions at MAANG Companies🔥🔥

Preparing for an SQL Interview at MAANG Companies? Here are some crucial SQL Questions you should be ready to tackle:

1. How do you retrieve all columns from a table?

SELECT * FROM table_name;

2. What SQL statement is used to filter records?

SELECT * FROM table_name
WHERE condition;

The WHERE clause is used to filter records based on a specified condition.

3. How can you join multiple tables? Describe different types of JOINs.

SELECT columns
FROM table1
JOIN table2 ON table1.column = table2.column
JOIN table3 ON table2.column = table3.column;

Types of JOINs:

1. INNER JOIN: Returns records with matching values in both tables

SELECT * FROM table1
INNER JOIN table2 ON table1.column = table2.column;

2. LEFT JOIN: Returns all records from the left table & matched records from the right table. Unmatched records will have NULL values.

SELECT * FROM table1
LEFT JOIN table2 ON table1.column = table2.column;

3. RIGHT JOIN: Returns all records from the right table & matched records from the left table. Unmatched records will have NULL values.

SELECT * FROM table1
RIGHT JOIN table2 ON table1.column = table2.column;

4. FULL JOIN: Returns records when there is a match in either left or right table. Unmatched records will have NULL values.

SELECT * FROM table1
FULL JOIN table2 ON table1.column = table2.column;

4. What is the difference between WHERE & HAVING clauses?

WHERE: Filters records before any groupings are made.

SELECT * FROM table_name
WHERE condition;

HAVING: Filters records after groupings are made.

SELECT column, COUNT(*)
FROM table_name
GROUP BY column
HAVING COUNT(*) > value;

5. How do you calculate average, sum, minimum & maximum values in a column?

Average: SELECT AVG(column_name) FROM table_name;

Sum: SELECT SUM(column_name) FROM table_name;

Minimum: SELECT MIN(column_name) FROM table_name;

Maximum: SELECT MAX(column_name) FROM table_name;

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Skills to master as a web developer

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🌐 Complete Roadmap to Become a Web Developer

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– How the internet works
– What is HTTP/HTTPS, DNS, Hosting, Domain
– Difference between frontend & backend

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∟📌 HTML – Structure of web pages
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⚙️ Basic Programming Elements You Should Know 💻

These elements are the building blocks of every program. They allow programs to store data, perform operations, and execute instructions.

Variable
A variable is a named storage location used to store data in memory. Its value can change during program execution.

Example:
age = 26
name = "Ajay"

Here:
• age stores a number
• name stores text

Variables help store information that programs can use later.

Constant

A constant is a value that does not change during program execution. Constants are used when a value should remain fixed.

Example:
PI = 3.14159
MAX_USERS = 100

By convention, constants are often written in uppercase. They help prevent accidental modification of important values.

Data Type
A data type defines the kind of data a variable stores.

Common data types include:
• Integer: count = 10
• Float: price = 19.99
• String: city = "Jodhpur"
• Boolean: is_active = True

Data types help the computer understand how to process and store data.

Operator
Operators are symbols used to perform operations on values or variables.

• Arithmetic Operators: a = 10; b = 5; print(a + b)
• Comparison Operators: print(a > b)
• Logical Operators: x = True; y = False; print(x and y)

Operators are used in calculations and decision-making.

Expression
An expression is a combination of values, variables, and operators that produces a result.

Example: result = (10 + 5) * 2

Here the expression (10 + 5) * 2 is evaluated first, and the result is stored in result.

Expressions are commonly used in calculations and conditions.

Statement
A statement is a single instruction that the computer executes.

Example:
score = 90
print(score)

Each line represents a statement telling the computer what to do. Programs are made up of many statements executed in sequence.

⭐ Key Idea
Basic programming elements such as variables, constants, data types, operators, expressions, and statements form the core of writing programs.

Understanding these concepts makes it much easier to learn any programming language.

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🖥 Joins In SQL All Types

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