444/sql/update.html


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  <section id="update">
<h1 id="sql-update--page-root">UPDATE<a class="headerlink" href="#sql-update--page-root" title="Permalink to this heading">#</a></h1>
<section id="synopsis">
<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this heading">#</a></h2>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>UPDATE table_name SET [ ( column = expression [, ... ] ) ] [ WHERE condition ]
</pre></div>
</div>
</section>
<section id="description">
<h2 id="description">Description<a class="headerlink" href="#description" title="Permalink to this heading">#</a></h2>
<p>Update selected columns values in existing rows in a table.</p>
<p>The columns named in the <code class="docutils literal notranslate"><span class="pre">column</span> <span class="pre">=</span> <span class="pre">expression</span></code> assignments will be updated
for all rows that match the <code class="docutils literal notranslate"><span class="pre">WHERE</span></code> condition.  The values of all column update
expressions for a matching row are evaluated before any column value is changed.
When the type of the expression and the type of the column differ, the usual implicit
CASTs, such as widening numeric fields, are applied to the <code class="docutils literal notranslate"><span class="pre">UPDATE</span></code> expression values.</p>
</section>
<section id="examples">
<h2 id="examples">Examples<a class="headerlink" href="#examples" title="Permalink to this heading">#</a></h2>
<p>Update the status of all purchases that haven’t been assigned a ship date:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">UPDATE</span>
  <span class="n">purchases</span>
<span class="k">SET</span>
  <span class="n">status</span> <span class="o">=</span> <span class="s1">'OVERDUE'</span>
<span class="k">WHERE</span>
  <span class="n">ship_date</span> <span class="k">IS</span> <span class="k">NULL</span><span class="p">;</span>
</pre></div>
</div>
<p>Update the account manager and account assign date for all customers:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">UPDATE</span>
  <span class="n">customers</span>
<span class="k">SET</span>
  <span class="n">account_manager</span> <span class="o">=</span> <span class="s1">'John Henry'</span><span class="p">,</span>
  <span class="n">assign_date</span> <span class="o">=</span> <span class="n">now</span><span class="p">();</span>
</pre></div>
</div>
<p>Update the manager to be the name of the employee who matches the manager ID:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">UPDATE</span>
  <span class="n">new_hires</span>
<span class="k">SET</span>
  <span class="n">manager</span> <span class="o">=</span> <span class="p">(</span>
    <span class="k">SELECT</span>
      <span class="n">e</span><span class="p">.</span><span class="n">name</span>
    <span class="k">FROM</span>
      <span class="n">employees</span> <span class="n">e</span>
    <span class="k">WHERE</span>
      <span class="n">e</span><span class="p">.</span><span class="n">employee_id</span> <span class="o">=</span> <span class="n">new_hires</span><span class="p">.</span><span class="n">manager_id</span>
  <span class="p">);</span>
</pre></div>
</div>
</section>
<section id="limitations">
<h2 id="limitations">Limitations<a class="headerlink" href="#limitations" title="Permalink to this heading">#</a></h2>
<p>Some connectors have limited or no support for <code class="docutils literal notranslate"><span class="pre">UPDATE</span></code>.
See connector documentation for more details.</p>
</section>
</section>


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