Implement indexing on the product, customer, and time columns to enhance query performance, despite the potential increase in storage requirements and impact on insert operations.

Create a materialized view of the query results to store them in a separate table for faster access, acknowledging the challenges with large datasets or frequently changing data.

Partition the sales transaction table by product, customer, and time to allow the query to scan only relevant partitions, thereby reducing the amount of data processed and improving performance without significantly increasing storage or maintenance complexity.

Denormalize the sales transaction table by including product, customer, and time information directly in the fact table to improve query performance, despite the potential increase in data redundancy and maintenance complexity.