A functional dependency α → β is called a partial dependency if there is aproper subset γ of α such that γ → β; we say that β is partially dependent on α. Arelation schema R is in second normal form (2NF) if each attribute A in R meetsone of the following criteria:• It appears in a candidate key • It is not partially dependent on a candidate key. Show that every 3NF schema is in 2NF. (Hint: Show that every partial dependency is a transitive dependency.)

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A:

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Q: the dependencies A →→ BC, B → D, and C →→ E

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Q: Describe the meaning of a Functional Dependency between attributes in a single relation A1 → A2. Use…

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A:

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Q: Compute the candidate key (if any) and minimal set for the following functional dependency…

A: refer to answer

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Q: can be converted to a strong entity set by simply adding the appropriate attributes. Why,

A: For the following reasons, a weak entity set is required:

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Q: Let a prime attribute be one that appears in at least one candidate key. Let α andβ be sets of…

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Intermediate SQL Concepts

A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most widely used programming language for retrieving and organizing data from relational databases. Collection of tables with rows and columns is referred to as a database. SQL is the language of databases. It makes it easier to extract specific data from databases, which can then be used for analysis.