This question runs in a pre-configured Salesforce environment - no personal connection required.
Update all Account records where AnnualRevenue is greater than or equal to a given revenue threshold, setting their Rating field to 'Hot'. Return the total count of accounts that were updated. Use a bulk-safe pattern by querying all qualifying accounts first, then updating them in a single DML statement.
Examples:
Input: revenueThreshold = 100000000
Output: 5
Explanation: Accounts with AnnualRevenue >= 100000000 get Rating set to 'Hot', count returned
Input: revenueThreshold = 999999999999
Output: 0
Explanation: No accounts exceed the threshold, nothing is updated
Input: revenueThreshold = null
Output: 0
Explanation: Null threshold returns 0 without performing any DML
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