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In the phone book example with a composite index created on the columns (city, last_name, first_name), if we search by giving exact values for all the three fields, search time is minimal—but if we provide the values for city and first_name only, the search uses only the city field to retrieve all matched
An attribute in a relational database can be represented as a column or field. In computing, an attribute is a specification that defines a property of an object, element, or file. It may also refer to or set the specific value for a given instance of such. For clarity, attributes should more correctly be considered metadata. An attribute is ...
All functions in lambda calculus and in some functional programming languages (especially those descended from ML) are technically unary, but see n-ary below. According to Quine , the Latin distributives being singuli , bini , terni , and so forth, the term "singulary" is the correct adjective, rather than "unary". [ 6 ]
A record, also known as a data structure, allows logically related data to be identified by a single name. Identifying related data as a single group is central to the construction of understandable computer programs. [2] The individual fields in a record may be accessed by name, just like any variable in a computer program. [3]
A graph database (GDB) is a database that uses graph structures for semantic queries with nodes, edges, and properties to represent and store data. [1] A key concept of the system is the graph (or edge or relationship).
An SQL select statement and its result. In computing, a database is an organized collection of data or a type of data store based on the use of a database management system (DBMS), the software that interacts with end users, applications, and the database itself to capture and analyze the data.
It is also possible to list the pages with {{Special:WhatLinksHere/Page name|namespace=number}}, where Page name is the name of the page, and namespace (optional) is the number of the namespace. E.g. {{Special:WhatLinksHere/Help:What links here|namespace=0}} lists all pages from article space that link to this page.
Entities and relationships can both have attributes. For example, an employee entity might have a Social Security Number (SSN) attribute, while a proved relationship may have a date attribute. All entities except weak entities must have a minimal set of uniquely identifying attributes that may be used as a unique/primary key.