A developer would use the LookupRows function instead of the Lookup AMPscript function to return a complete rowset from the data extension (A). The LookupRows function retrieves all rows that match a specified criterion, returning a rowset that can be further processed or iterated over in AMPscript. In contrast, the Lookup function retrieves only a single field value from the first row that matches the specified criteria.
References:
Salesforce Marketing Cloud AMPscript Guide
Salesforce Marketing Cloud AMPscript Functions
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