Solution:Step 1: Identify values in table_x not in table_ytable_x has 10,20,30; table_y has 20,40,50; values unique to table_x are 10 and 30.Step 2: EXCEPT returns these unique valuesThe query returns 10 and 30.Final Answer:10, 30 -> Option AQuick Check:EXCEPT output = 10, 30 [OK]

[Solved] Given two tables:table_x:val102030table_y:val204050What is the output of:SELECT val FROM table_x EXCEPT SELECT val FROM table_y; | PostgreSQL

PostgreSQL - Set Operations and Advanced Queries

Given two tables:
table_x:
val
10
20
30

table_y:
val
20
40
50

What is the output of:
SELECT val FROM table_x EXCEPT SELECT val FROM table_y;

A10, 30

B20

C40, 50

D10, 20, 30

Step-by-Step Solution

Solution:

Step 1: Identify values in table_x not in table_y
table_x has 10,20,30; table_y has 20,40,50; values unique to table_x are 10 and 30.
Step 2: EXCEPT returns these unique values
The query returns 10 and 30.
Final Answer:
10, 30 -> Option A
Quick Check:
EXCEPT output = 10, 30 [OK]

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

Common Mistakes:

Including values from second table
Confusing EXCEPT with INTERSECT
Expecting all values combined

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Given two tables:

Step 1: Identify values in table_x not in table_y

Step 2: EXCEPT returns these unique values

Final Answer:

Quick Check:

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