音译汉 During a typical day,you’re likely to encounter many types of databases,such as a library card catalog,a banking database that contains your checking account balances,CD-ROM encyclopedias,your computer’s directory of files,and your e-ma
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音译汉 During a typical day,you’re likely to encounter many types of databases,such as a library card catalog,a banking database that contains your checking account balances,CD-ROM encyclopedias,your computer’s directory of files,and your e-ma
音译汉
During a typical day,you’re likely to encounter many types of databases,such as a library card catalog,a banking database that contains your checking account balances,CD-ROM encyclopedias,your computer’s directory of files,and your e-mail address book.You might also interact with collections of information accessed via the internet,such as Web sites devoted to hip-hop music,the stock market,the job market,or travel.
Databases come in two “flavors”:structured databases and freeform databases.A structured database(also called a “structured data file”)is a file of information organized in a uniform format of records and fields.Figure 3-30 shows an example of a record from a structured database for a library card catalog.
音译汉 During a typical day,you’re likely to encounter many types of databases,such as a library card catalog,a banking database that contains your checking account balances,CD-ROM encyclopedias,your computer’s directory of files,and your e-ma
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