Logical database in ABAP

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What is logical database. Explain its main elements.
How is the hierarchy of tables determined in a LDB?
Explain the following ways to retrieve data from tables: a.) Select Statement b.) Database Program
How is the layout of database program determined?
Is it possible to modify the pre-generated screen in a LDB? How?
How is the order in which the data is made available to the reports determined?
What all things determine the behavior of the database at runtime?
Explain Root. Can there be more than one roots in the structure?
Is it important to maintain parent child relationship between the tables in LDB? Why?
How would you extract data from tables in the report?
Explain a.)SQL Report b.)Application c.)Foreign Key
How does LDB read the data from the database table?
What would happen if there doesn't exist a get statement for a particular node of a LDB in a report?
How would you define input fields on the selection screen of a LDB?
How can you improve the response time in a LDB?
What is the maximum number of nodes you can have in a LDB?
What are the advantages of LDB?
Why are Dictionary Structures declared in Report?
How do you access data using LDB? 

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