I just got curse 326 and it database.I found tables of orderT and datailorderT why orderT table has customer address fields as well as tex filed in both table.

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Reply from Richard Rost:

This was explained in previous lessons - which is why I recommend you start from the beginning and don't skip around. Some customer data, such as ADDRESS is stored in BOTH tables in case the address changes. You can update the customer's account to reflect his current address, but the address of the ORDER stays the same - so you know where an order was SHIPPED, for example.