Solution:Step 1: Understand WHERE clause effectThe condition Authors.id = 2 unambiguously refers to the Authors table.Step 2: Determine filtered rowsIt filters to only author with id=2 (Mary) paired with all books.Final Answer:Rows where author id equals 2 only -> Option AQuick Check:WHERE Authors.i

[Solved] Consider the tables:Authors:id | name1 | John2 | MaryBooks:id | title1 | Book A2 | Book B3 | Book CWhat will be the output of:SELECT name, title FROM Authors CROSS JOIN Books WHERE Authors.... | PostgreSQL

PostgreSQL - Joins in PostgreSQL

ARows where author id equals 2 only

BRows where book id equals 2 only

CRows where author id or book id equals 2

DAll rows from CROSS JOIN without filtering

Step-by-Step Solution

Solution:

Step 1: Understand WHERE clause effect
The condition Authors.id = 2 unambiguously refers to the Authors table.
Step 2: Determine filtered rows
It filters to only author with id=2 (Mary) paired with all books.
Final Answer:
Rows where author id equals 2 only -> Option A
Quick Check:
WHERE Authors.id=2 filters to author id=2 [OK]

Quick Trick: Always qualify columns in WHERE after CROSS JOIN to avoid ambiguity [OK]

Common Mistakes:

Assuming WHERE filters both tables correctly without qualification
Ignoring ambiguous column error
Expecting no filtering without ON clause

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Consider the tables:

Step 1: Understand WHERE clause effect

Step 2: Determine filtered rows

Final Answer:

Quick Check:

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