The  statement that is true is the total number of items bought on a specific date can be known by searching the data for all transactions that took place on the said date.
The reason why one should use the total number of items gotten on a specific date can be known through by searching the data for all transactions that took place on the said date and then add up all the values of items bought for all matching transaction.
Note that by doing so, one can be able to know the  transactions that has been made at the store during a 7-day period.
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