What is wrong with this GraphQL query if the client wants only the user's email but the query is:

medium📝 Debug Q7 of 15

GraphQL - Basics and Philosophy

{ user { id name email } }

AIt causes under-fetching by missing email

BIt has invalid syntax due to extra fields

CIt causes over-fetching by requesting unnecessary fields

DIt will cause a server error

Step-by-Step Solution

Solution:

Step 1: Analyze requested fields
The query requests id, name, and email.
Step 2: Compare with client needs
The client only needs email, so id and name are extra.
Final Answer:
It causes over-fetching by requesting unnecessary fields -> Option C
Quick Check:
Extra fields = Over-fetching [OK]

Quick Trick: Request only needed fields to avoid over-fetching [OK]

Common Mistakes:

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