What is FromSqlRaw safety rule?
PICTURE THIS: DATABASE INDEX
Without indexScan every row
With indexJump to keys
CostWrites slower
Simple meaning
Always parameterize user input.
WHY — EF Core instead of guessing?
Why interviewers care about EF Core:
EF Core questions separate
people who only read docs from people who shipped.
Keep it short, concrete,
and tied to .NET work.
Stay structured
Name the idea, why it exists, then one short example.
Close cleanly
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1Define it
Always parameterize user input.
- 2Why it exists
String concat opens SQL injection.
- 3How it works
FromSqlInterpolated helps with FormattableString parameters.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Say this line
“String concat opens SQL injection.”
Break into beats
StringconcatopensSQLinjection
Speaking order
298740833747163290
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
Always parameterize user input. String concat opens SQL injection.