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Consider an information system designed for an online company which provides IT products and services These include desktops, laptops, networking products, IT books, parts, and
Explain data abstraction? Data abstraction Data abstraction is a methodology in which enables us to isolate how a compound data object is utilized from the details of how it is
Mappings between Levels and Data Independence The 3 levels of abstraction in the database do not exist separately of each other. There must be some correspondence, or mapping
What is database utility? Database utility is the interface among the ABAP/4 Dictionary and the underlying the SAP system.
ddlc
the of super market system done in database
Backward Recovery (UNDO): In this system the uncommitted changes made by a transaction to a database are undone. Instead the system is reset to the last consistent state of databa
Explain the function of Object model Object model describes the classes of objects in system, including their attributes and operations which they support. The analysis object
Multi-Key File Organisation In this part, we will introduce two basic file Organisation schemes that permit records to be accessed by more than one key field, therefore, allowi
what is Mapping Constraints? with examples
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