Interview Questions 21 total
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16What is the difference between var, let, and const in JavaScript?
All three declare variables, but with different scope and mutability:
**var:** function-scoped, hoisted, can be redeclared
**let:** block-s...
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17How do you find duplicate rows in SQL?
```sql
-- Find duplicates by email
SELECT email, COUNT(*) as count
FROM users
GROUP BY email
HAVING COUNT(*) > 1;
-- Delete duplicates, kee...
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18What is the difference between INNER JOIN and LEFT JOIN in SQL?
**INNER JOIN** — returns only rows where there is a match in BOTH tables
**LEFT JOIN** — returns ALL rows from the left table + matching...
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19Top 10 Python interview questions for data science jobs
Here are the most commonly asked Python questions in data science interviews:
1. Difference between list, tuple, and set
2. Explain generat...
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20What is the difference between == and is in Python?
**==** checks value equality — are the values the same?
**is** checks identity — are they the exact same object in memory?
```python
a ...
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21What is the difference between a list and a tuple in Python?
Python is one of the most commonly asked Python basics interview questions.
A **list** is mutable (you can change its elements), while a **...
