Solution:Step 1: Understand UNION behaviorUNION returns distinct rows from both queries combined.Step 2: Analyze dataCustomers names: John, Jane; Subscribers names: Jane, MikeStep 3: Combine distinct namesResult: John, Jane, MikeFinal Answer:John, Jane, Mike -> Option AQuick Check:Duplicates remove

[Solved] Given two tables:Customers: id, name1, John2, JaneSubscribers: id, name2, Jane3, MikeWhat will be the result of:SELECT name FROM Customers UNION SELECT name FROM Subscribers; | SQL

SQL - Set Operations

Given two tables:

Customers: id, name
1, John
2, Jane

Subscribers: id, name
2, Jane
3, Mike

What will be the result of:
SELECT name FROM Customers UNION SELECT name FROM Subscribers;

AJohn, Jane, Mike

BJohn, Jane, Jane, Mike

CJohn, Mike

DJane, Mike

Step-by-Step Solution

Solution:

Step 1: Understand UNION behavior
UNION returns distinct rows from both queries combined.
Step 2: Analyze data
Customers names: John, Jane; Subscribers names: Jane, Mike
Step 3: Combine distinct names
Result: John, Jane, Mike
Final Answer:
John, Jane, Mike -> Option A
Quick Check:
Duplicates removed by UNION [OK]

Quick Trick: UNION removes duplicates from combined results [OK]

Common Mistakes:

MISTAKES

Assuming UNION ALL behavior
Counting duplicates twice
Ignoring distinctness of UNION

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More SQL Quizzes

Given two tables:

Step 1: Understand UNION behavior

Step 2: Analyze data

Step 3: Combine distinct names

Final Answer:

Quick Check:

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