Chapter 6 Data Management數據管理
Chapter 6 Data Management 數據管理
Data must be carefully control Ise To get accurate and meaningful result To protect the computer hardware from being damaged
Data must be carefully control because ◼ To get accurate and meaningful result ◼ To protect the computer hardware from being damaged
Sources of error(錯誤來源) ■ Fill in error(填寫錯誤) ■ Transcription error(抄寫錯誤) Input error(輸入錯誤)
Sources of error (錯誤來源) ◼ Fill in error (填寫錯誤) ◼ Transcription error (抄寫錯誤) ◼ Input error (輸入錯誤)
How to control? Data verification(數據核對) Data validation(數據驗證)
How to control? Data verification (數據核對) Data validation (數據驗證)
Data verification(數據核對) Display data to let the user check again and ask for confirm double check ■ Triple check For example: Bill Payment System Ticket Booking System
Data verification (數據核對) ◼ Display data to let the user check again and ask for confirm ◼ Double check ◼ Triple check ◼ ……. ◼ For example : Bill Payment System, Ticket Booking System