[Solved] Which of the following best describes the alias used with a subquery in the FROM clause? — Ans: It names the derived table so you can reference it in the outer query | SQL

SQL - Subqueries

Which of the following best describes the alias used with a subquery in the FROM clause?

AIt creates a new database schema

BIt renames columns permanently in the database

CIt is optional and has no effect

DIt names the derived table so you can reference it in the outer query

Step-by-Step Solution

Solution:

Step 1: Understand aliasing in subqueries
When you use a subquery in the FROM clause, you must give it an alias to refer to it in the main query.
Step 2: Clarify the purpose of the alias
The alias acts like a temporary table name, allowing you to select or join its columns.
Final Answer:
It names the derived table so you can reference it in the outer query -> Option D
Quick Check:
Alias in FROM subquery = Temporary table name [OK]

Quick Trick: Always alias your subquery in FROM clause [OK]

Common Mistakes:

MISTAKES

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Which of the following best describes the alias used with a subquery in the FROM clause?