Скачать или смотреть 🔥 HOW TO IMPROVE SQL FOR INTERVIEWS PART 2

PART 2 — MASTER THE CORE SQL THAT ALWAYS COMES

Every SQL interview, no matter the company, revolves around a few core topics.

You must be very comfortable with:

• WHERE vs HAVING
• INNER JOIN vs LEFT JOIN
• GROUP BY
• COUNT, SUM, AVG
• NULL handling

Then move to:

• Subqueries
• Window functions (ROW_NUMBER, RANK, SUM OVER)

👉 Don’t try to learn everything at once.
Depth in basics beats shallow advanced topics.

Practice rule:

For every query, ask yourself:

• Why did I use this JOIN?
• Why did I group here?
• What happens if data changes?

Takeaway:
If you can explain your SQL,
you can clear interviews.

🏁 FINAL TRUTH (SAVE THIS)

Strong SQL is not about speed.
It’s about clarity and confidence.

If you can explain your query,
you can clear SQL interviews.

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