Consider the following database in Prolog: birthday(tom). birthday(fred). birthday(helen), birthday(jack). happy(mary). happy(jane). happy(helen). happy(albert). attendparty(jane). attendparty(helen). hold_party(X): - birthday(X), happy(X) What would be the answer to the following query? ?- hold party(Who) a. Who = jane. b. Who = mary. c. Who = helen. d. All of the above. e. Who cannot be unified / instantiated.

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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.