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A relational database management system uses SQL MERGE (also called upsert) statements to INSERT new records or UPDATE or DELETE existing records depending on whether condition matches. It was officially introduced in the SQL:2003 standard, and expanded [citation needed] in the SQL:2008 standard.
An INSERT statement can also be used to retrieve data from other tables, modify it if necessary and insert it directly into the table. All this is done in a single SQL statement that does not involve any intermediary processing in the client application. A subselect is used instead of the VALUES clause. The subselect can contain joins, function ...
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 ...
Actual SQL implementations normally use other approaches, such as hash joins or sort-merge joins, since computing the Cartesian product is slower and would often require a prohibitively large amount of memory to store. SQL specifies two different syntactical ways to express joins: the "explicit join notation" and the "implicit join notation".
Penn State and Notre Dame are vying to end three decade-long national championship droughts and can move a step closer Thursday night when they collide in the Orange Bowl.
Podcast king Joe Rogan said Sunday the mysterious drones that have buzzed around the tristate area have left him “genuinely concerned” after watching a video that floated an unverified theory ...
Alfa Anderson, a vocalist known for her work with the iconic 1970s disco band Chic, has died. She was 78. Niles Rodgers, founder of Chic, shared the news in an Instagram post on Dec. 17. “RIP ...
Data merge may refer to: Mail merge; Data integration; Merge algorithm; See also. Merge (disambiguation) This page was last edited on 28 ...