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Explain conditional writes
This interview card covers Explain conditional writes. Safety. Write succeeds only if condition true — create-once, stock>0, version match. Show one expression.
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What this card says
What it is
Safety.
Why it matters
Write succeeds only if condition true — create-once, stock>0, version match.
attribute_not_exists
How / example
Show one expression.
MNC: race example.