real estate firm has a number of SALES_OFFICE in several states. Attributes of SALES_OFFICE include OfficeNumber (identifier) and Location. Each SALES_OFFICE is assigned one or more employees. Attributes of EMPLOYEE includes EmployeelD (identifier) and EmployeeName. An employee is assigned to one and only one sales office. For each sales office, there is only one employee assigned to manage that office. An employee may manage only the sales office to which he or she is assigned. The firm lists PROPERTY for sale. Attributes of PROPERTY include PropertyID (identifier) and Location. Components of Location include Address, City, State, and ZipCode. Each property is listed with one and only one of the sales offices. A sales office may have any number of properties listed or may have no properties listed. Each property has one or more owners. An owner may own one or more properties. Attributes of OWNER is OwnerID (identifier) and OwnerName. An attribute of the relationship between property and owner is PercentOwned.

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SQL

SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.  

Queries

A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.