Solution:Step 1: Understand EXCEPTThe EXCEPT operation returns rows from the first query that are not present in the second.Step 2: Apply to given datatableA has (5), (6), (7); tableB has (6), (7), (8). Rows (6) and (7) are in both, so they are excluded.Final Answer:(5) -> Option CQuick Check:Verify

[Solved] Given two tables:tableA(id) VALUES (5), (6), (7);tableB(id) VALUES (6), (7), (8);What will be the output of this query?SELECT id FROM tableA EXCEPT SELECT id FROM tableB; | PostgreSQL

PostgreSQL - Set Operations and Advanced Queries

Given two tables:
tableA(id) VALUES (5), (6), (7);
tableB(id) VALUES (6), (7), (8);
What will be the output of this query?

SELECT id FROM tableA EXCEPT SELECT id FROM tableB;

A(8)

B(6), (7)

C(5)

D(5), (8)

Step-by-Step Solution

Solution:

Step 1: Understand EXCEPT
The EXCEPT operation returns rows from the first query that are not present in the second.
Step 2: Apply to given data
tableA has (5), (6), (7); tableB has (6), (7), (8). Rows (6) and (7) are in both, so they are excluded.
Final Answer:
(5) -> Option C
Quick Check:
Verify rows unique to first table [OK]

Quick Trick: EXCEPT returns rows only in first query [OK]

Common Mistakes:

Confusing EXCEPT with INTERSECT
Including rows from second table
Assuming EXCEPT returns duplicates

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Given two tables:

Step 1: Understand EXCEPT

Step 2: Apply to given data

Final Answer:

Quick Check:

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