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Which is an advantage of view? The Advantages of view is Data security, Derived columns and Hiding of complex queries
what is correlation in nested query
Explain how the associations are implemented as classes. A general approach in this case is to transform an association class into a simple class linked to two original classes
#questiontypes of keys examples..
What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
what is natural join?
What is Identity? Identity (or AutoNumber) is a column that automatically produces numeric values. A start and increment value can be set, but most DBA leave these at 1. A GUID
Explain the concept of Modeling With Objects A model is a conceptual representation of a specification, design or system from a particular point of view. A modelling language
What's the difference between a primary key and a unique key? Both primary key and unique key enforces uniqueness of the column on which they are explained. But by default prim
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