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What are data models? Explain it detail?
Entity relationship model
Rectangles
Ellipse
Diamonds
Lines
Relational model
Relational model use a collection of tables to show both data and the relationships between those data. Every table has a multiple columns and each columns has unique name
Other data models
Object oriented data model
Object relational data model
Network data model
Hierarchical data model
Northwind Pty Ltd sells a variety of food products throughout the world. They want to use the reporting features of SAP's Business Information Warehouse to better understand their
Enumerate or state the steps in creating a relevant database of a shop.
A student entity type has the following attributes,name..
domain
Which operation is used if we are interested in only certain columns of a table? PROJECTION operation is used if we are interested in only certain columns of a table.
Define shadow paging. An alternative to log-based crash recovery method is shadow paging. This technique requires fewer disk accesses than do the log-based methods.
Normal 0 false false false EN-US X-NONE X-NONE
Define Assertions in SQL a. An assertion is a predicate that is expressing a condition we wish the database to always satisfy. b. Domain constraints, functional dependency
Which model is record based logical model? Network Modelis basically known as record based logical model.
Describe how you can simplify Operations. To simplify operation, one should use inheritance, where possible to use, to reduce the quantity of distinct operations. Introduce new
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