Solution:Step 1: Understand MATERIALIZED effect on CTEUsing MATERIALIZED forces PostgreSQL to store the CTE result before the outer query uses it.Step 2: Analyze query filteringThe outer query filters the stored CTE result by id < 10, so filtering happens after storage.Final Answer:The CTE result

[Solved] Given the query:WITH cte AS MATERIALIZED (SELECT id FROM users WHERE active = true) SELECT * FROM cte WHERE id < 10;What is the effect of MATERIALIZED here? | PostgreSQL

PostgreSQL - Common Table Expressions

Given the query:

WITH cte AS MATERIALIZED (SELECT id FROM users WHERE active = true) SELECT * FROM cte WHERE id < 10;

What is the effect of MATERIALIZED here?

AThe CTE result is stored temporarily before filtering by <code>id < 10</code>

BThe CTE is inlined and filtered directly without storing

CThe query will produce a syntax error

DThe CTE is ignored and the main query runs alone

Step-by-Step Solution

Solution:

Step 1: Understand MATERIALIZED effect on CTE
Using MATERIALIZED forces PostgreSQL to store the CTE result before the outer query uses it.
Step 2: Analyze query filtering
The outer query filters the stored CTE result by id < 10, so filtering happens after storage.
Final Answer:
The CTE result is stored temporarily before filtering by id < 10 -> Option A
Quick Check:
MATERIALIZED = store then filter [OK]

Quick Trick: MATERIALIZED stores CTE before outer query filters [OK]

Common Mistakes:

Thinking filtering happens before storing
Assuming MATERIALIZED causes syntax error
Believing CTE is ignored

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Given the query:

Step 1: Understand MATERIALIZED effect on CTE

Step 2: Analyze query filtering

Final Answer:

Quick Check:

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