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SOLVED: Telecommunications Billing InvoiceA telecommunications company charges its customers for both incoming and outgoing calls based on the number of call units. A call unit is an internal representation of the amount that the company should charge its customers. It maintains the records of all the calls made on its network in the tablecallrecord, storing information such as incoming number, outgoing number, duration of the call, and the date on which the call was made. Write a query to calcu

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Comarch - Global IT Business Products Provider

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