Solution:Step 1: Analyze the subqueryThe subquery counts orders per user and aliases as t.Step 2: Apply the WHERE filterThe outer query selects users with total orders less than 5.Final Answer:Users with fewer than 5 orders -> Option AQuick Check:Subquery counts orders; outer filters count < 5 [O

[Solved] Consider the query:SELECT t.user_id, t.total_orders FROM (SELECT user_id, COUNT(*) AS total_orders FROM orders GROUP BY user_id) AS t WHERE t.total_orders < 5;What does this query return? | PostgreSQL

PostgreSQL - Subqueries in PostgreSQL

Consider the query:

SELECT t.user_id, t.total_orders FROM (SELECT user_id, COUNT(*) AS total_orders FROM orders GROUP BY user_id) AS t WHERE t.total_orders < 5;

What does this query return?

AUsers with fewer than 5 orders

BAll orders with user IDs

CUsers with exactly 5 orders

DSyntax error due to missing GROUP BY

Step-by-Step Solution

Solution:

Step 1: Analyze the subquery
The subquery counts orders per user and aliases as t.
Step 2: Apply the WHERE filter
The outer query selects users with total orders less than 5.
Final Answer:
Users with fewer than 5 orders -> Option A
Quick Check:
Subquery counts orders; outer filters count < 5 [OK]

Quick Trick: Subquery counts; outer query filters by count condition [OK]

Common Mistakes:

Confusing total orders with individual orders
Missing GROUP BY in subquery
Misinterpreting the WHERE clause

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Consider the query:

Step 1: Analyze the subquery

Step 2: Apply the WHERE filter

Final Answer:

Quick Check:

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