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case study
List the string operations supported by SQL? 1) Pattern matching Operation 2) Concatenation 3) Extracting character strings 4) Converting among uppercase and lower cas
3NF Normal Form A relation schema R is in 3NF if it is in 2NF and for each FD X A either of the following is true X is a Super-key of R. A is a prime attribute of R
Explain four causes for failures in data warehouse projects
Types of data independence Data independence can be classified into the following two types: Physical Data Independence: This means that for any change made in the physi
Which is the properties of entities? Attributes is the properties of entities.
What will be create when a primary key if combined with a foreign key? A primary key if combined with a foreign key it creates Parent-Child relationship between the tables that
what is Storage-Device Hierarchy question
Answer SQL Queries to extract data from data tables and questions on mapping conceptual data models into relational data model.
Question 1 List and explain various Normal Forms. How BCNF differs from the Third Normal Form and 4th Normal forms? Question 2 Describe the concepts of Structural Semantic Da
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