Introduction to Database System
Which type of entity cannot exist in the database unless another type of entity also exists in the database, but does not require that the identifier of that other entity be included as part of its own identifier?

ID-dependent entity
ID- independent entity
Weak entity
Strong entity

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Introduction to Database System
With respect to data input, the most accurate description of batch control is

None of these
All of these
dividing documents to be entered into batches
controlling the input of each input clerk
comparing to a pre-calculated figure the total of a data item summed across a batch records put into the system

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