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Allen Downey
2020-12-15 11:21:16 -05:00
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01_query.html
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@@ -109,27 +109,27 @@
</li>
<li class="toctree-l1">
<a class="reference internal" href="03_motion.html">
Chapter 3
Proper Motion
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</li>
<li class="toctree-l1">
<a class="reference internal" href="04_select.html">
Chapter 4
Transformation and Selection
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<li class="toctree-l1">
<a class="reference internal" href="05_join.html">
Chapter 5
Joining Tables
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<li class="toctree-l1">
<a class="reference internal" href="06_photo.html">
Chapter 6
Photometry
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<li class="toctree-l1">
<a class="reference internal" href="07_plot.html">
Chapter 7
Visualization
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<div class="section" id="id1">
<h3>Exercise<a class="headerlink" href="#id1" title="Permalink to this headline"></a></h3>
<p>Read <a class="reference external" href="https://gea.esac.esa.int/archive/documentation/GDR2/Gaia_archive/chap_datamodel/sec_dm_main_tables/ssec_dm_gaia_source.html">the documentation of this table</a> and choose a column that looks interesting to you. Add the column name to the query and run it again. What are the units of the column you selected? What is its data type?</p>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># Solution</span>
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<li><p>While you are debugging, use <code class="docutils literal notranslate"><span class="pre">TOP</span></code> to limit the number of rows in the result. That will make each test run faster, which reduces your development time.</p></li>
<li><p>Launching test queries synchronously might make them start faster, too.</p></li>
</ul>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># Solution</span>
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<div class="section" id="operators">