Chapter 45: PostgreSQL Quiz

PostgreSQL Quiz.

So far we have been doing the teacher → student flow: I explain → give examples → give mini-homework → you try.

Now we flip the classroom.

PostgreSQL Quiz means you become the one answering — I become the one asking questions, checking answers, giving hints, explaining why something is correct/wrong, and awarding imaginary marks + feedback.

This is the fastest way to move from “I think I understand” to “I can actually use it under pressure”.

How this PostgreSQL Quiz session works

Rules (our class agreement):

1. I will ask 10 questions of increasing difficulty
   • 1–3 : Very easy / revision
   • 4–7 : Medium / real-world common mistakes
   • 8–10 : Harder / interview / production thinking
2. You answer one by one (just reply with your answer to each question)
3. After each answer I will:
   • Say correct / wrong / partially correct
   • Give detailed explanation + marks (out of 10)
   • Give hint / follow-up question if needed
4. At the end → total score + personalized feedback + which topics need more practice

You can:

• Answer immediately
• Ask for hint (“hint please” or “can you give one more clue?”)
• Skip a question (“pass” or “skip this one”)
• Ask me to explain a concept before answering

Ready?

Let’s begin the PostgreSQL Quiz – February 2026 Edition

PostgreSQL Quiz – Round 1 (Questions 1–3: Warm-up)

Question 1 – Easy What will be the result of this query?

A) true B) false C) error D) NULL

Your answer?

(Just reply with A, B, C or D — or write the full explanation if you want extra marks)

Go ahead — first question is on the board! 🚀