Deprecated: $wgMWOAuthSharedUserIDs=false is deprecated, set $wgMWOAuthSharedUserIDs=true, $wgMWOAuthSharedUserSource='local' instead [Called from MediaWiki\HookContainer\HookContainer::run in /var/www/html/w/includes/HookContainer/HookContainer.php at line 135] in /var/www/html/w/includes/Debug/MWDebug.php on line 372
Logic language of queries - MaRDI portal

Deprecated: Use of MediaWiki\Skin\SkinTemplate::injectLegacyMenusIntoPersonalTools was deprecated in Please make sure Skin option menus contains `user-menu` (and possibly `notifications`, `user-interface-preferences`, `user-page`) 1.46. [Called from MediaWiki\Skin\SkinTemplate::getPortletsTemplateData in /var/www/html/w/includes/Skin/SkinTemplate.php at line 691] in /var/www/html/w/includes/Debug/MWDebug.php on line 372

Deprecated: Use of MediaWiki\Skin\BaseTemplate::getPersonalTools was deprecated in 1.46 Call $this->getSkin()->getPersonalToolsForMakeListItem instead (T422975). [Called from Skins\Chameleon\Components\NavbarHorizontal\PersonalTools::getHtml in /var/www/html/w/skins/chameleon/src/Components/NavbarHorizontal/PersonalTools.php at line 66] in /var/www/html/w/includes/Debug/MWDebug.php on line 372

Deprecated: Use of QuickTemplate::(get/html/text/haveData) with parameter `personal_urls` was deprecated in MediaWiki Use content_navigation instead. [Called from MediaWiki\Skin\QuickTemplate::get in /var/www/html/w/includes/Skin/QuickTemplate.php at line 131] in /var/www/html/w/includes/Debug/MWDebug.php on line 372

Logic language of queries (Q797307)

From MaRDI portal





scientific article; zbMATH DE number 3868667
Language Label Description Also known as
English
Logic language of queries
scientific article; zbMATH DE number 3868667

    Statements

    title
    Logic language of queries (English)
    0 references
    author
    V. S. Smirnov
    0 references
    publication date
    1983
    0 references
    review text
    The paper attempts to extend Codd's relational calculus and relational algebra to relations with null values. Unfortunately, the basic framework is unclearly defined and is poorly motivated, and the basic result of the paper is never stated precisely and no proof is given.
    0 references
    zbMATH Keywords
    database
    0 references
    querly language
    0 references
    relational algebra
    0 references
    relational calculus
    0 references
    null value
    0 references

    Identifiers

    Mathematics Subject Classification ID
    68P20
    0 references
    68P05
    0 references
    68Q65
    0 references
    zbMATH DE Number
    3868667
    0 references
     
    Retrieved from "https://mardi.schubotz.org/w/index.php?title=Item:Q797307&oldid=43907713"
    Powered by MediaWiki