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[主观题]

Which of the following statements about databases is wrong （）

A．Database and database system are not the same concepts． The scope of database system is much larger than that of database system．

B．External connection is divided into left connection, right connection and self-connection．

C．The horizontal part of a database table is called a row, the vertical part is called a column, the content of each row is called a record,and the column name of each column is called a fiel

D．Before operating a data table,you should specify in which database the operation is performed using the "USE database name", otherwise the "No database selected" error will be thrown．

提问人：网友regabber 发布时间：2022-01-07

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Which of the following statements about databases is wrong ()

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D．Before operating a data table,you should specify in which database the operation is performed using the "USE database name", otherwise the "No database selected" error will be thrown．

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