You want to write a PL/pgSQL function that returns the sum of all even numbers from 1 to a given integer n. Which approach correctly uses advanced PL/pgSQL features to achieve this?

hard📝 Application Q8 of 15

PostgreSQL - Advanced PL/pgSQL

AWrite a single SQL SELECT without any procedural code

BDeclare a variable but do not initialize or update it

CUse a WHILE loop but skip checking for even numbers

DUse a FOR loop with an IF condition inside to check even numbers and accumulate sum

Step-by-Step Solution

Solution:

Step 1: Understand the problem requirements
We need to sum even numbers from 1 to n, which requires looping and conditional checks.
Step 2: Identify correct PL/pgSQL approach
A FOR loop with IF condition to check evenness and accumulate sum uses procedural features effectively.
Final Answer:
Use a FOR loop with an IF condition inside to check even numbers and accumulate sum -> Option D
Quick Check:
Loop + condition = correct advanced PL/pgSQL use [OK]

Quick Trick: Combine loops and conditions for complex logic [OK]

Common Mistakes:

Ignoring condition to check even numbers
Using SQL only without procedural logic
Not updating sum variable

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You want to write a PL/pgSQL function that returns the sum of all even numbers from 1 to a given integer n. Which approach correctly uses advanced PL/pgSQL features to achieve this?

Step 1: Understand the problem requirements

Step 2: Identify correct PL/pgSQL approach

Final Answer:

Quick Check:

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