BDI302cXuất hiện trong 3 đề thi
Suppose a registration website creates data with the following fields for each person registered (note: if the user does not input a value, NULL is stored instead): Name, Date, Address, and Account Number. Suppose 100 people sign up for our system and of the 100 people, 60 of them did not input an address. The system lists the values as NULL for these empty entries in the address field. Would this situation still have structure for our data?
Các lựa chọn
ANo because the majority of data do not have a specific field filled, thus our originally defined structure is lost.
BYes the data has structure because we have placed a structural constraint on the data, thus the data will always have the originally defined structure.