Table 11.7, from a relational database, contains a number of rows and columns. When data are entered into the table, all columns must have data entered. Information about product descriptions, prices, product groups and rack locations is not held elsewhere. Explain how, because of its design, the table contains data duplicated in fields and contains the potential for insertion, update and deletion anomalies. What is meant by these anomalies and what could be done to prevent them?