[Solved] Which statement about writable CTEs is true? — Ans: Writable CTEs can return data and modify it in one query | PostgreSQL

PostgreSQL - Common Table Expressions

Which statement about writable CTEs is true?

AWritable CTEs cannot modify data, only read it

BWritable CTEs can return data and modify it in one query

CWritable CTEs create permanent tables

DWritable CTEs are only used for performance optimization

Step-by-Step Solution

Solution:

Step 1: Recall writable CTE behavior
Writable CTEs allow data modification and can return the modified rows.
Step 2: Verify other options
Writable CTEs do not create permanent tables and are not just for optimization.
Final Answer:
Writable CTEs can return data and modify it in one query -> Option B
Quick Check:
Writable CTEs = Modify + Return data [OK]

Quick Trick: Writable CTEs combine data change and retrieval [OK]

Common Mistakes:

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Which statement about writable CTEs is true?