In manual bookkeeping values are entered into columns labelled DR (debit) or CR (credit). In a database it is much easier and more efficient to store the values as positive and negative (DR = +, CR = –), and display the appropriate bookkeeping term on the screen and in reports.
I will use the DR/CR notation discussing processing though I may occasionally display data as +/-.
You'll find more about these bookkeeping terms here.
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