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Query by Example (QBE) is a database query language for relational databases. It was devised by Moshé M. Zloof at IBM Research during the mid-1970s, in parallel to the development of SQL . [ 1 ] It is the first graphical query language, using visual tables where the user would enter commands, example elements and conditions.
A query language, also known as data query language or database query language (DQL), is a computer language used to make queries in databases and information systems. In database systems, query languages rely on strict theory to retrieve information. [1] A well known example is the Structured Query Language (SQL).
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
In a SQL database query, a correlated subquery (also known as a synchronized subquery) is a subquery (a query nested inside another query) that uses values from the outer query. This can have major impact on performance because the correlated subquery might get recomputed every time for each row of the outer query is processed.
Along with companies like Wistia and Brightcove, SproutVideo is commonly listed as an alternative for business video hosting , rather than larger services like YouTube and Vimeo, which often focus more on sharing video content widely rather than keeping videos private or restricted to a select group of people.
YouTube (formerly YouTube Spotlight) is the official YouTube channel for the American video-sharing platform YouTube, spotlighting videos and events on the platform. Events shown on the channel include YouTube Comedy Week and the YouTube Music Awards .
Wikipedia:Wikimedia Commons – as of September 2013, has over 18 million media files (photographs, diagrams, animations, music, spoken text, video clips, etc.) available for use in any Wikimedia (community) project, as well as for free downloading by anyone. Anything other than non-free content should be uploaded to the Commons, not to the ...
The most common free software license, the GNU General Public License (GPL), is a form of copyleft and is used for the Linux kernel and many of the components from the GNU Project. [ 109 ] Linux-based distributions are intended by developers for interoperability with other operating systems and established computing standards.
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