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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">From (SQL)</span></h1>
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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="de" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="de" dir="ltr"><p>Die <b>FROM</b>-Klausel in der <a href="Datenbanksprache" title="Datenbanksprache">Datenbanksprache</a> <a href="SQL" title="SQL">SQL</a> definiert die Verwendung einer oder mehrerer Tabellen in einer Abfrage. Als reserviertes Wort im <a href="SQL#Sprachstandard" title="SQL">SQL-Standard</a> lautet die allgemeine Form einer Abfrage:<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</p>
<pre><b><code>SELECT</code></b> <i>Spaltenname</i> <b><code>FROM</code></b> <i>Tabellenname</i> [<b><code>WHERE</code></b> <i>Bedingung</i>]
</pre>
<p>Die <code>FROM</code>-Klausel gibt die Tabellen für zu löschende Zeilen innerhalb von Delete-Anweisungen an und definiert die Tabellen für Abfragen in Unterabfragen (Subqueries) von <a href="Update_(SQL)" title="Update (SQL)">Update</a>-Anweisungen. <a href="Datenbanktabelle" title="Datenbanktabelle">Tabellen</a>, <a href="Sicht_(Datenbank)" title="Sicht (Datenbank)">Sichten</a> (Views) oder aber auch Informationsschemata (allgemeine Datenbankinformationen) bilden die Grundlage für die <code>FROM</code>-Klausel.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Beispiele">Beispiele</h2></div>
<p>Gebe nur Zeilen der Tabelle <i>meineTabelle</i> aus mit Spaltenwerten von <i>meineSpalte</i> größer als 100:
</p>
<div class="mw-highlight mw-highlight-lang-sql mw-content-ltr" dir="ltr"><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span>
<span class="k">FROM</span><span class="w"> </span><span class="n">meineTabelle</span>
<span class="k">WHERE</span><span class="w"> </span><span class="n">meineSpalte</span><span class="w"> </span><span class="o">></span><span class="w"> </span><span class="mi">100</span>
</pre></div>
<p>Entferne alle Einträge der Tabelle Bäume mit einer Höhe kleiner als 80.
</p>
<div class="mw-highlight mw-highlight-lang-sql mw-content-ltr" dir="ltr"><pre><span></span><span class="k">DELETE</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">Bäume</span>
<span class="w"> </span><span class="k">WHERE</span><span class="w"> </span><span class="n">Höhe</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="mi">80</span><span class="p">;</span>
</pre></div>
<p>Verwende die <code>FROM</code>-Klausel in einer Unterabfrage (auch Subquery genannt), um die Bedingungen für die Auswahl von zu verändernden Zeilen zu definieren:
</p>
<div class="mw-highlight mw-highlight-lang-sql mw-content-ltr" dir="ltr"><pre><span></span><span class="k">UPDATE</span><span class="w"> </span><span class="n">T1</span>
<span class="w"> </span><span class="k">SET</span><span class="w"> </span><span class="n">C1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">2</span>
<span class="w"> </span><span class="k">WHERE</span><span class="w"> </span><span class="n">C2</span><span class="w"> </span><span class="k">IN</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="k">SELECT</span><span class="w"> </span><span class="n">C3</span>
<span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">T2</span>
<span class="w"> </span><span class="k">WHERE</span><span class="w"> </span><span class="n">C4</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span>
</pre></div>
<div class="mw-heading mw-heading2"><h2 id="Datenbankoperationen_ohne_FROM">Datenbankoperationen ohne FROM</h2></div>
<p>Manche <a href="Datenbank#Datenbankmanagementsystem" title="Datenbank">DBMS</a> benötigen die <code>FROM</code>-Klausel nicht, um einen einzelnen Wert oder eine einzelne Zeile auszugeben. In <a href="Oracle_(Datenbanksystem)" title="Oracle (Datenbanksystem)">Datenbanksystem von Oracle</a> funktioniert dies z. B. über die sogenannte DUAL Table:<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-highlight mw-highlight-lang-sql mw-content-ltr" dir="ltr"><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="mi">3</span><span class="p">.</span><span class="mi">14</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="n">Kreiszahl</span>
</pre></div>
<p>Andere Systeme erfordern jedoch auch hier ein <a href="Schl%C3%BCsselwort_(Programmierung)" title="Schlüsselwort (Programmierung)">Schlüsselwort</a> (auch Keyword genannt) um die betreffende Daten auszuwählen:<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-highlight mw-highlight-lang-sql mw-content-ltr" dir="ltr"><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">to_char</span><span class="p">(</span><span class="n">sysdate</span><span class="p">,</span><span class="w"> </span><span class="s1">'Dy DD-Mon-YYYY HH24:MI:SS'</span><span class="p">)</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="ss">"Aktuelle Zeit"</span>
<span class="k">FROM</span><span class="w"> </span><span class="n">dual</span><span class="p">;</span>
</pre></div>
<p>In Sybase benötigt die Ausgabe von <a href="Variable_(Programmierung)#Variablen_in_einer_Blockstruktur" title="Variable (Programmierung)">globalen Variablen</a> wie die verwendete Version keine <code>FROM</code>-Klausel:<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-highlight mw-highlight-lang-sql mw-content-ltr" dir="ltr"><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="o">@@</span><span class="k">version</span>
</pre></div>
<p>Eine <code>UPDATE</code>-Anweisung ohne Unterabfrage benötigt keine <code>FROM</code>-Klausel:<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup>:
</p>
<div class="mw-highlight mw-highlight-lang-sql mw-content-ltr" dir="ltr"><pre><span></span><span class="k">UPDATE</span><span class="w"> </span><span class="n">t1</span><span class="w"> </span><span class="k">SET</span><span class="w"> </span><span class="n">col1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">col1</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span>
</pre></div>
<div class="mw-heading mw-heading2"><h2 id="Siehe_auch">Siehe auch</h2></div>
<ul><li><a href="Data_Manipulation_Language" title="Data Manipulation Language">Data Manipulation Language (DML)</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="Einzelnachweise">Einzelnachweise</h2></div>
<ol class="references">
<li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><span class="cite"><a href="Microsoft" title="Microsoft">Microsoft</a>: <a rel="nofollow" class="external text" href="https://docs.microsoft.com/de-de/sql/t-sql/queries/from-transact-sql?view=sql-server-2017"><i>From clause in Transact SQL.</i></a><span class="Abrufdatum"> Abgerufen am 3. Dezember 2018</span>.</span><span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AFrom+%28SQL%29&rft.title=From+clause+in+Transact+SQL&rft.description=From+clause+in+Transact+SQL&rft.identifier=https%3A%2F%2Fdocs.microsoft.com%2Fde-de%2Fsql%2Ft-sql%2Fqueries%2Ffrom-transact-sql%3Fview%3Dsql-server-2017&rft.creator=%5B%5BMicrosoft%5D%5D"> </span></span>
</li>
<li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">↑</a></span> <span class="reference-text"><span class="cite"><a href="Drupal" title="Drupal">Drupal</a>: <a rel="nofollow" class="external text" href="https://www.drupal.org/docs/develop/coding-standards/list-of-sql-reserved-words"><i>Reserved Words in SQL.</i></a><span class="Abrufdatum"> Abgerufen am 3. Dezember 2018</span>.</span><span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AFrom+%28SQL%29&rft.title=Reserved+Words+in+SQL&rft.description=Reserved+Words+in+SQL&rft.identifier=https%3A%2F%2Fwww.drupal.org%2Fdocs%2Fdevelop%2Fcoding-standards%2Flist-of-sql-reserved-words&rft.creator=%5B%5BDrupal%5D%5D"> </span></span>
</li>
<li id="cite_note-3"><span class="mw-cite-backlink"><a href="#cite_ref-3">↑</a></span> <span class="reference-text"><span class="cite"><a href="Microsoft" title="Microsoft">Microsoft</a>: <a rel="nofollow" class="external text" href="https://docs.microsoft.com/en-us/sql/relational-databases/system-information-schema-views/system-information-schema-views-transact-sql?view=sql-server-2017"><i>System Information Schema Views (Transact-SQL).</i></a><span class="Abrufdatum"> Abgerufen am 3. Dezember 2018</span>.</span><span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AFrom+%28SQL%29&rft.title=System+Information+Schema+Views+%28Transact-SQL%29&rft.description=System+Information+Schema+Views+%28Transact-SQL%29&rft.identifier=https%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fsql%2Frelational-databases%2Fsystem-information-schema-views%2Fsystem-information-schema-views-transact-sql%3Fview%3Dsql-server-2017&rft.creator=%5B%5BMicrosoft%5D%5D"> </span></span>
</li>
<li id="cite_note-4"><span class="mw-cite-backlink"><a href="#cite_ref-4">↑</a></span> <span class="reference-text"><span class="cite"><a href="Oracle" title="Oracle">Oracle</a>: <a rel="nofollow" class="external text" href="https://docs.oracle.com/cd/B19306_01/server.102/b14200/queries009.htm"><i>Selecting from the DUAL Table.</i></a><span class="Abrufdatum"> Abgerufen am 3. Dezember 2018</span>.</span><span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AFrom+%28SQL%29&rft.title=Selecting+from+the+DUAL+Table&rft.description=Selecting+from+the+DUAL+Table&rft.identifier=https%3A%2F%2Fdocs.oracle.com%2Fcd%2FB19306_01%2Fserver.102%2Fb14200%2Fqueries009.htm&rft.creator=%5B%5BOracle%5D%5D"> </span></span>
</li>
<li id="cite_note-5"><span class="mw-cite-backlink"><a href="#cite_ref-5">↑</a></span> <span class="reference-text"><span class="cite">Infolab <a href="Stanford_University" title="Stanford University">Stanford University</a>: <a rel="nofollow" class="external text" href="http://infolab.stanford.edu/~ullman/fcdb/oracle/or-time.html"><i>Oracle Dates and Times.</i></a><span class="Abrufdatum"> Abgerufen am 3. Dezember 2018</span>.</span><span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AFrom+%28SQL%29&rft.title=Oracle+Dates+and+Times&rft.description=Oracle+Dates+and+Times&rft.identifier=http%3A%2F%2Finfolab.stanford.edu%2F%7Eullman%2Ffcdb%2Foracle%2For-time.html&rft.creator=Infolab+%5B%5BStanford+University%5D%5D"> </span></span>
</li>
<li id="cite_note-6"><span class="mw-cite-backlink"><a href="#cite_ref-6">↑</a></span> <span class="reference-text"><span class="cite"><a href="Sybase" title="Sybase">Sybase</a>: <a rel="nofollow" class="external text" href="http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.infocenter.dc38151.1510/html/iqrefbb/CACGCGBI.htm"><i>Sybooks Online: Chapter 2: SQL Language Elements: Global variables.</i></a><span class="Abrufdatum"> Abgerufen am 3. Dezember 2018</span>.</span><span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AFrom+%28SQL%29&rft.title=Sybooks+Online%3A+Chapter+2%3A+SQL+Language+Elements%3A+Global+variables&rft.description=Sybooks+Online%3A+Chapter+2%3A+SQL+Language+Elements%3A+Global+variables&rft.identifier=http%3A%2F%2Finfocenter.sybase.com%2Fhelp%2Findex.jsp%3Ftopic%3D%2Fcom.sybase.infocenter.dc38151.1510%2Fhtml%2Fiqrefbb%2FCACGCGBI.htm&rft.creator=%5B%5BSybase%5D%5D"> </span></span>
</li>
<li id="cite_note-7"><span class="mw-cite-backlink"><a href="#cite_ref-7">↑</a></span> <span class="reference-text"><span class="cite"><a href="MySQL" title="MySQL">MySQL</a>: <a rel="nofollow" class="external text" href="https://dev.mysql.com/doc/refman/8.0/en/update.html"><i>UPDATE Syntax.</i></a><span class="Abrufdatum"> Abgerufen am 3. Dezember 2018</span>.</span><span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AFrom+%28SQL%29&rft.title=UPDATE+Syntax&rft.description=UPDATE+Syntax&rft.identifier=https%3A%2F%2Fdev.mysql.com%2Fdoc%2Frefman%2F8.0%2Fen%2Fupdate.html&rft.creator=%5B%5BMySQL%5D%5D"> </span></span>
</li>
</ol>
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<div class="klappleiste-kopf"><a href="SQL" title="SQL">SQL</a><div class="erweiterte-navigationsleiste-quicklinks" style="float:left; font-weight:normal; font-size:75%; margin-left:1em; margin-right:2em; display:none;"><span title="Vorlage anzeigen">V</span> </div></div>
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<td class="erw-nav-gruppe" style="white-space: nowrap;text-align: right;border: 1px solid transparent;border-top: 1px solid #FFF;border-bottom: 2px solid #FFF;padding: 0 1em;"><b><a href="Anweisung_(Programmierung)" title="Anweisung (Programmierung)">Anweisungen</a> und Klauseln</b>
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<p>As •
Case •
Create •
Delete •
<a class="mw-selflink selflink">From</a> •
Having •
Insert •
<a href="Join_(SQL)" title="Join (SQL)">Join</a> •
Merge •
Null •
Order by •
Prepare •
Select •
Truncate •
Union •
<a href="Update_(SQL)" title="Update (SQL)">Update</a> •
Where •
With
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<td class="erw-nav-gruppe" style="white-space: nowrap;text-align: right;border: 1px solid transparent;border-top: 1px solid #FFF;border-bottom: 1px solid #FFF;padding: 0 1em;"><b>Varianten</b>
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<p><a href="PL/SQL" title="PL/SQL">PL/SQL</a> •
<a href="Transact-SQL" title="Transact-SQL">Transact-SQL</a> •
<a href="Open_SQL" title="Open SQL">Open SQL</a> •
<a href="Embedded_SQL" title="Embedded SQL">Embedded SQL</a> •
<a href="PostgreSQL" title="PostgreSQL">PostgreSQL</a>
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