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  2. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.

  3. Comparison of relational database management systems - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_relational...

    Note (2): MariaDB and MySQL provide ACID compliance through the default InnoDB storage engine. [71] [72] Note (3): "For other than InnoDB storage engines, MySQL Server parses and ignores the FOREIGN KEY and REFERENCES syntax in CREATE TABLE statements. The CHECK clause is parsed but ignored by all storage engines." [73]

  4. Join (SQL) - Wikipedia

    en.wikipedia.org/wiki/Join_(SQL)

    PostgreSQL, MySQL and Oracle support natural joins; Microsoft T-SQL and IBM DB2 do not. The columns used in the join are implicit so the join code does not show which columns are expected, and a change in column names may change the results.

  5. UTF-16 - Wikipedia

    en.wikipedia.org/wiki/UTF-16

    UTF-16 (16-bit Unicode Transformation Format) is a character encoding method capable of encoding all 1,112,064 valid code points of Unicode. [a] The encoding is variable-length as code points are encoded with one or two 16-bit code units.

  6. Universally unique identifier - Wikipedia

    en.wikipedia.org/wiki/Universally_unique_identifier

    For example, the number of random version-4 UUIDs which need to be generated in order to have a 50% probability of at least one collision is 2.71 quintillion, computed as follows: [27] n ≈ 1 2 + 1 4 + ln ⁡ ( 2 ) × 2 123 ≈ 2.71 × 10 18 . {\displaystyle n\approx {\frac {1}{2}}+{\sqrt {{\frac {1}{4}}+\ln(2)\times 2^{123}}}\approx 2.71 ...

  7. String operations - Wikipedia

    en.wikipedia.org/wiki/String_operations

    A string substitution or simply a substitution is a mapping f that maps characters in Σ to languages (possibly in a different alphabet). Thus, for example, given a character a ∈ Σ, one has f(a)=L a where L a ⊆ Δ * is some language whose alphabet is Δ. This mapping may be extended to strings as f(ε)=ε

  8. Wikipedia - Wikipedia

    en.wikipedia.org/wiki/Wikipedia

    Various collaborative online encyclopedias were attempted before the start of Wikipedia, but with limited success. [19] Wikipedia began as a complementary project for Nupedia, a free online English-language encyclopedia project whose articles were written by experts and reviewed under a formal process. [20]

  9. Wikipedia:Reference desk/Archives/Miscellaneous/June 2006 ...

    en.wikipedia.org/wiki/Wikipedia:Reference_desk/...

    The captain is responsible for all souls on board,therefore in the event of a disaster he has to get everyone off first then himself.If there wasn't time then he naturally went down with the ship.There are various literary examples of this but all I can think of right now is "The boy Stood on the Burning Deck" which is supposed to be based on a ...