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This is the chosen solution. It ensures that the program will be fully established meet the requirements of users, software can be changed, if they want users. This relationship shows that a receipt has one customer, one online shopping equipment and one administration. In addition, a customer can have many receipts; online shopping equipment can process many receipts; and online shopping equipment, products can be sold many times to administrator. It shown in Fig. 2.4.1.
Fig. 2.4.1 ERD of current system
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| Identification of user needs | | | Table 2 |