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Beschikbaar in 26 talen" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-26" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">26 talen</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%85%D9%81%D8%AA%D8%A7%D8%AD_%D8%B1%D8%A6%D9%8A%D8%B3%D9%8A" title="مفتاح رئيسي – Arabisch" lang="ar" hreflang="ar" data-title="مفتاح رئيسي" data-language-autonym="العربية" data-language-local-name="Arabisch" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9F%D1%8A%D1%80%D0%B2%D0%B8%D1%87%D0%B5%D0%BD_%D0%BA%D0%BB%D1%8E%D1%87" title="Първичен ключ – Bulgaars" lang="bg" hreflang="bg" data-title="Първичен ключ" data-language-autonym="Български" data-language-local-name="Bulgaars" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Clau_prim%C3%A0ria" title="Clau primària – Catalaans" lang="ca" hreflang="ca" data-title="Clau primària" data-language-autonym="Català" data-language-local-name="Catalaans" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Prim%C3%A1rn%C3%AD_kl%C3%AD%C4%8D" title="Primární klíč – Tsjechisch" lang="cs" hreflang="cs" data-title="Primární klíč" data-language-autonym="Čeština" data-language-local-name="Tsjechisch" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de badge-Q70894304 mw-list-item" title=""><a href="https://de.wikipedia.org/wiki/Prim%C3%A4rschl%C3%BCssel" title="Primärschlüssel – Duits" lang="de" hreflang="de" data-title="Primärschlüssel" data-language-autonym="Deutsch" data-language-local-name="Duits" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Primary_key" title="Primary key – Engels" lang="en" hreflang="en" data-title="Primary key" data-language-autonym="English" data-language-local-name="Engels" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Clave_primaria" title="Clave primaria – Spaans" lang="es" hreflang="es" data-title="Clave primaria" data-language-autonym="Español" data-language-local-name="Spaans" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%DA%A9%D9%84%DB%8C%D8%AF_%D8%A7%D8%B5%D9%84%DB%8C" title="کلید اصلی – Perzisch" lang="fa" hreflang="fa" data-title="کلید اصلی" data-language-autonym="فارسی" data-language-local-name="Perzisch" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Cl%C3%A9_primaire" title="Clé primaire – Frans" lang="fr" hreflang="fr" data-title="Clé primaire" data-language-autonym="Français" data-language-local-name="Frans" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%9E%D7%A4%D7%AA%D7%97_%D7%A8%D7%90%D7%A9%D7%99" title="מפתח ראשי – Hebreeuws" lang="he" hreflang="he" data-title="מפתח ראשי" data-language-autonym="עברית" data-language-local-name="Hebreeuws" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Kunci_primer" title="Kunci primer – Indonesisch" lang="id" hreflang="id" data-title="Kunci primer" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesisch" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Chiave_primaria" title="Chiave primaria – Italiaans" lang="it" hreflang="it" data-title="Chiave primaria" data-language-autonym="Italiano" data-language-local-name="Italiaans" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E4%B8%BB%E3%82%AD%E3%83%BC" title="主キー – Japans" lang="ja" hreflang="ja" data-title="主キー" data-language-autonym="日本語" data-language-local-name="Japans" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%9D%D0%B5%D0%B3%D1%96%D0%B7%D0%B3%D1%96_%D0%BA%D1%96%D0%BB%D1%82" title="Негізгі кілт – Kazachs" lang="kk" hreflang="kk" data-title="Негізгі кілт" data-language-autonym="Қазақша" data-language-local-name="Kazachs" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EA%B8%B0%EB%B3%B8_%ED%82%A4" title="기본 키 – Koreaans" lang="ko" hreflang="ko" data-title="기본 키" data-language-autonym="한국어" data-language-local-name="Koreaans" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Kekunci_primer" title="Kekunci primer – Maleis" lang="ms" hreflang="ms" data-title="Kekunci primer" data-language-autonym="Bahasa Melayu" data-language-local-name="Maleis" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Klucz_g%C5%82%C3%B3wny" title="Klucz główny – Pools" lang="pl" hreflang="pl" data-title="Klucz główny" data-language-autonym="Polski" data-language-local-name="Pools" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Chave_prim%C3%A1ria" title="Chave primária – Portugees" lang="pt" hreflang="pt" data-title="Chave primária" data-language-autonym="Português" data-language-local-name="Portugees" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9F%D0%B5%D1%80%D0%B2%D0%B8%D1%87%D0%BD%D1%8B%D0%B9_%D0%BA%D0%BB%D1%8E%D1%87" title="Первичный ключ – Russisch" lang="ru" hreflang="ru" data-title="Первичный ключ" data-language-autonym="Русский" data-language-local-name="Russisch" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Prim%C3%A1rny_k%C4%BE%C3%BA%C4%8D" title="Primárny kľúč – Slowaaks" lang="sk" hreflang="sk" data-title="Primárny kľúč" data-language-autonym="Slovenčina" data-language-local-name="Slowaaks" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/%C3%87el%C3%ABsi_par%C3%ABsor" title="Çelësi parësor – Albanees" lang="sq" hreflang="sq" data-title="Çelësi parësor" data-language-autonym="Shqip" data-language-local-name="Albanees" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9F%D1%80%D0%B8%D0%BC%D0%B0%D1%80%D0%BD%D0%B8_%D0%BA%D1%99%D1%83%D1%87" title="Примарни кључ – Servisch" lang="sr" hreflang="sr" data-title="Примарни кључ" data-language-autonym="Српски / srpski" data-language-local-name="Servisch" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9F%D0%B5%D1%80%D0%B2%D0%B8%D0%BD%D0%BD%D0%B8%D0%B9_%D0%BA%D0%BB%D1%8E%D1%87" title="Первинний ключ – Oekraïens" lang="uk" hreflang="uk" data-title="Первинний ключ" data-language-autonym="Українська" data-language-local-name="Oekraïens" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Kh%C3%B3a_ch%C3%ADnh" title="Khóa chính – Vietnamees" lang="vi" hreflang="vi" data-title="Khóa chính" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamees" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%85%B3%E7%B3%BB%E9%94%AE" title="关系键 – Chinees" lang="zh" hreflang="zh" data-title="关系键" data-language-autonym="中文" data-language-local-name="Chinees" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E4%B8%BB%E5%8C%99" title="主匙 – Kantonees" lang="yue" hreflang="yue" data-title="主匙" data-language-autonym="粵語" data-language-local-name="Kantonees" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q934729#sitelinks-wikipedia" title="Taalkoppelingen bewerken" class="wbc-editpage">Koppelingen bewerken</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Naamruimten"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Primaire_sleutel" title="Inhoudspagina bekijken [c]" accesskey="c"><span>Artikel</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Overleg:Primaire_sleutel&action=edit&redlink=1" rel="discussion" class="new" title="Overleg over deze pagina (de pagina bestaat niet) [t]" accesskey="t"><span>Overleg</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Taalvariant wijzigen" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Nederlands</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Weergaven"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Primaire_sleutel"><span>Lezen</span></a></li><li id="ca-ve-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Primaire_sleutel&veaction=edit" title="Deze pagina bewerken [v]" accesskey="v"><span>Bewerken</span></a></li><li id="ca-edit" class="collapsible vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Primaire_sleutel&action=edit" title="Broncode van deze pagina bewerken [e]" accesskey="e"><span>Brontekst bewerken</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Primaire_sleutel&action=history" title="Eerdere versies van deze pagina [h]" accesskey="h"><span>Geschiedenis weergeven</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Paginahulpmiddelen"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" 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<button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">naar zijbalk verplaatsen</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">verbergen</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="Meer opties" > <div class="vector-menu-heading"> Handelingen </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/Primaire_sleutel"><span>Lezen</span></a></li><li id="ca-more-ve-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Primaire_sleutel&veaction=edit" title="Deze pagina bewerken [v]" accesskey="v"><span>Bewerken</span></a></li><li id="ca-more-edit" 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accesskey="g"><span>Wikidata-item</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Paginahulpmiddelen"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Uiterlijk"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Uiterlijk</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">naar zijbalk verplaatsen</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">verbergen</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Uit Wikipedia, de vrije encyclopedie</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="nl" dir="ltr"><p><b>Primaire sleutel</b> is in <a href="/wiki/Database" title="Database">databasetechnologie</a> de benaming voor een <a href="/wiki/Attribuut_(informatica)" title="Attribuut (informatica)">attribuut</a>, eigenschap, karakteristiek of feit (of een combinatie hiervan) over een entiteit, fysiek object of gebeurtenis die voldoet aan volgende vier eisen: </p> <ol><li><i><a href="/wiki/Uniciteit" title="Uniciteit">Uniekheid</a></i>: de waarde van het attribuut (of een combinatie hiervan) is uniek binnen de tabel en bepaalt dus eenduidig de record, rij of tupel waarin dit attribuut voorkomt. Geen twee rijen in een tabel kunnen dus identiek zijn vanwege het unieke attribuut (of combinatie van) in iedere rij.</li> <li><i>Niet leeg</i>: het attribuut (of een combinatie hiervan) is overal ingevuld. Kan dus niet leeg zijn.</li> <li><i>Minimaal aantal attributen</i>: de combinatie van attributen is minimaal. Door het laten vallen van een van de attributen wordt het record, rij of tupel niet langer meer eenduidig bepaald.</li> <li><i>Legt relatie tussen tabellen</i>: wanneer gerelateerde tabellen verwijzen naar de tabel waarin het attribuut (of een combinatie hiervan) voorkomt, wordt deze gebruikt om een relatie tussen deze tabellen tot stand te brengen.</li></ol> <p>Daar voorwaarde 1, 2 en 3 de voorwaarden zijn om te kunnen spreken van een <a href="/wiki/Kandidaatsleutel" title="Kandidaatsleutel">kandidaatsleutel</a>, kan een primaire sleutel ook worden omschreven als: </p> <ul><li><i>De kandidaatsleutel die wordt gebruikt als unieke identificatiemethode van een record, rij of tupel binnen een tabel.</i></li></ul> <div class="mw-heading mw-heading2"><h2 id="Zie_ook">Zie ook</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Primaire_sleutel&veaction=edit&section=1" title="Bewerk dit kopje: Zie ook" class="mw-editsection-visualeditor"><span>bewerken</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Primaire_sleutel&action=edit&section=1" title="De broncode bewerken van de sectie: Zie ook"><span>brontekst bewerken</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Databasenormalisatie" title="Databasenormalisatie">Databasenormalisatie</a></li></ul> <style data-mw-deduplicate="TemplateStyles:r67837862">.mw-parser-output .navigatie{position:relative;clear:both;overflow:auto;margin:1em auto -0.5em;padding:2px;background-color:var(--background-color-neutral-subtle,#f8f9fa);border:1px solid var(--border-color-base,#a2a9b1);text-align:center;font-size:87%}.mw-parser-output .navigatie-bewerken{margin-left:0.5em}.mw-parser-output .navigatie-bewerken .mw-ui-icon::before{background-size:0.9em}.mw-parser-output .navigatie-afb-links,.mw-parser-output .navigatie-afb-rechts{position:absolute}.mw-parser-output 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.rechts{padding-left:0.5em}@media screen and (max-width:640px){.mw-parser-output .navigatie-tabel tr{display:grid;grid-template-columns:1fr;width:100%;margin-bottom:0.5em}.mw-parser-output .navigatie-tabel tr:last-of-type{margin-bottom:0}.mw-parser-output .navigatie-tabel .links{text-align:unset}.mw-parser-output .navigatie-tabel .rechts{padding:unset}}</style><table class="navigatie-tabel vatop" cellpadding="0" cellspacing="0" style=""><tbody><tr><td class="links" style=""><b>Begrippen:</b></td><td class="rechts"><a href="/wiki/Database" title="Database">database</a> · <a href="/wiki/ACID" title="ACID">ACID</a> · <a href="/wiki/CRUD" title="CRUD">CRUD</a> · <a href="/wiki/Null" title="Null">null</a> · <a href="/wiki/Vreemde_sleutel" title="Vreemde sleutel">vreemde sleutel</a> · <a class="mw-selflink selflink">primaire sleutel</a> · <a href="/wiki/Kandidaatsleutel" title="Kandidaatsleutel">kandidaatsleutel</a> · <a href="/w/index.php?title=Axioma%27s_van_Armstrong&action=edit&redlink=1" class="new" title="Axioma's van Armstrong (de pagina bestaat niet)">axioma's van Armstrong</a></td></tr><tr><td class="links"><b>Objecten:</b></td><td class="rechts"><a href="/wiki/Tabel_(database)" title="Tabel (database)">tabel</a> · <a href="/wiki/Relatie" title="Relatie">relatie</a> · <a href="/w/index.php?title=View_(database)&action=edit&redlink=1" class="new" title="View (database) (de pagina bestaat niet)">view</a> · <a href="/wiki/Transactie_(dataopslag)" title="Transactie (dataopslag)">transactie</a> · <a href="/wiki/Trigger" title="Trigger">trigger</a> · <a href="/wiki/Index_(database)" title="Index (database)">index</a> · <a href="/wiki/Opgeslagen_procedure" title="Opgeslagen procedure">opgeslagen procedure</a> · <a href="/wiki/Cursor" title="Cursor">cursor</a> · <a href="/w/index.php?title=Partitie_(database)&action=edit&redlink=1" class="new" title="Partitie (database) (de pagina bestaat niet)">partitie</a></td></tr><tr><td class="links"><b><a href="/wiki/SQL" title="SQL">SQL</a>:</b></td><td class="rechts"><a href="/wiki/Select_(SQL)" title="Select (SQL)">Select</a> · <a href="/wiki/Insert_(SQL)" title="Insert (SQL)">Insert</a> · <a href="/wiki/Update_(SQL)" title="Update (SQL)">Update</a> · <a href="/wiki/Merge_(SQL)" title="Merge (SQL)">Merge</a> · <a href="/wiki/Delete_(SQL)" title="Delete (SQL)">Delete</a> · <a href="/wiki/From_(SQL)" title="From (SQL)">From</a> · <a href="/wiki/Join_(SQL)" title="Join (SQL)">Join</a> · <a href="/wiki/Union_(SQL)" title="Union (SQL)">Union</a> · <a href="/wiki/Create_(SQL)" title="Create (SQL)">Create</a> · <a href="/wiki/Drop_(SQL)" title="Drop (SQL)">Drop</a> · <a href="/wiki/Commit" title="Commit">Commit</a> · <a href="/wiki/Rollback_(dataopslag)" title="Rollback (dataopslag)">Rollback</a> · <a href="/wiki/Truncate_(SQL)" title="Truncate (SQL)">Truncate</a> · <a href="/wiki/Alter_(SQL)" title="Alter (SQL)">Alter</a> · <a 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