This question runs in a pre-configured Salesforce environment - no personal connection required.
Given a list of Opportunity records, advance every opportunity in the Proposal/Price Quote stage to the Negotiation/Review stage. Update only the changed records in a single DML statement and return how many were advanced. Return 0 for null or empty input.
Example 1:
Input: opps = [list of 8 opportunities in Proposal/Price Quote stage]
Output: 8
Explanation: All 8 opportunities have their StageName changed to Negotiation/Review and updated in a single DML call. The method returns 8.
Example 2:
Input: opps = null
Output: 0
Explanation: Null input returns 0 immediately without performing any DML.
Example 3:
Input: opps = [] (empty list)
Output: 0
Explanation: An empty list returns 0 without performing any DML.
Example 4:
Input: opps = [list of Closed Won opportunities]
Output: 0
Explanation: None of the records are in the Proposal/Price Quote stage so none are advanced and 0 is returned.
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