This question runs in a pre-configured Salesforce environment - no personal connection required.
Given a list of Account records and a Decimal revenue threshold, update the Rating field to 'Cold' for every Account whose AnnualRevenue is not null, is less than the threshold, and whose current Rating is not already 'Cold'. Perform a single bulk DML update and return the number of accounts that were updated. Return 0 for null or empty inputs and for a null threshold.
Examples:
Input: accounts = [Account(AnnualRevenue=1000000, Rating='Warm'), Account(AnnualRevenue=5000000, Rating='Hot')], threshold = 2000000
Output: 1
Explanation: Only the first account is below the threshold and not already Cold
Input: accounts = [Account(AnnualRevenue=100000, Rating='Cold')], threshold = 1000000
Output: 0
Explanation: The account is already Cold so no update is needed
Input: accounts = [Account(AnnualRevenue=null, Rating='Warm')], threshold = 1000000
Output: 0
Explanation: Accounts with null AnnualRevenue are skipped
Input: accounts = null, threshold = 1000
Output: 0
Explanation: Null input returns 0
Input: accounts = [Account(AnnualRevenue=500, Rating='Warm')], threshold = null
Output: 0
Explanation: Null threshold returns 0
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