Solution:Step 1: Understand NOT MATERIALIZED CTE behaviorNOT MATERIALIZED means the CTE is inlined and evaluated each time it appears.Step 2: Calculate cross join rowsCTE generates 2 rows (1,2), generate_series generates 3 rows (1,2,3). Cross join produces 2*3=6 rows.Final Answer:6 rows -> Option AQ

[Solved] Consider this query:WITH cte AS NOT MATERIALIZED (SELECT generate_series(1,2) AS num) SELECT num FROM cte, generate_series(1,3) AS gs(n);How many rows will the query return? | PostgreSQL

PostgreSQL - Common Table Expressions

Consider this query:

WITH cte AS NOT MATERIALIZED (SELECT generate_series(1,2) AS num) SELECT num FROM cte, generate_series(1,3) AS gs(n);

How many rows will the query return?

A6 rows

B2 rows

C3 rows

D1 row

Step-by-Step Solution

Solution:

Step 1: Understand NOT MATERIALIZED CTE behavior
NOT MATERIALIZED means the CTE is inlined and evaluated each time it appears.
Step 2: Calculate cross join rows
CTE generates 2 rows (1,2), generate_series generates 3 rows (1,2,3). Cross join produces 2*3=6 rows.
Final Answer:
6 rows -> Option A
Quick Check:
Non-materialized CTE cross join = product of rows [OK]

Quick Trick: Non-materialized CTE inlines; cross join multiplies rows [OK]

Common Mistakes:

Assuming fewer rows due to non-materialization
Confusing materialized and non-materialized effects
Counting only one side's rows

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Consider this query:

Step 1: Understand NOT MATERIALIZED CTE behavior

Step 2: Calculate cross join rows

Final Answer:

Quick Check:

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