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Su, Xiaomeng
76a5b1ee83
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: Su, Xiaomeng <suxiaomeng1@huawei.com> Co-committed-by: Su, Xiaomeng <suxiaomeng1@huawei.com>
29 lines
3.7 KiB
HTML
29 lines
3.7 KiB
HTML
<a name="dli_08_0124"></a><a name="dli_08_0124"></a>
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<h1 class="topictitle1">Querying an OpenTSDB Table</h1>
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<div id="body1578361312449"><p id="dli_08_0124__en-us_topic_0114776218_en-us_topic_0114689143_af7983162fc32438d819f21191736d15d">This <strong id="dli_08_0124__b4357165716470">SELECT</strong> command is used to query data in an OpenTSDB table.</p>
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<div class="note" id="dli_08_0124__en-us_topic_0114776218_en-us_topic_0111165158_note974625294015"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="dli_08_0124__ul31989267810"><li id="dli_08_0124__li819952614812">If no metric exists in OpenTSDB, an error will be reported when the corresponding DLI table is queried.</li><li id="dli_08_0124__li19199126280">If the security mode is enabled, you need to set <strong id="dli_08_0124__b331214486">conf:dli.sql.mrs.opentsdb.ssl.enabled</strong> to <strong id="dli_08_0124__b24912482">true</strong> when connecting to OpenTSDB.</li></ul>
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</div></div>
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<div class="section" id="dli_08_0124__en-us_topic_0114776218_en-us_topic_0114689143_s452ed7223e30489e8c84908d006db5f1"><h4 class="sectiontitle">Syntax</h4><div class="codecoloring" codetype="Sql" id="dli_08_0124__en-us_topic_0114776218_screen6800217452"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="k">table_name</span><span class="w"> </span><span class="k">LIMIT</span><span class="w"> </span><span class="nb">number</span><span class="p">;</span>
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</pre></div></td></tr></table></div>
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</div>
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</div>
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<div class="section" id="dli_08_0124__en-us_topic_0114776218_en-us_topic_0114689143_s022cdf3e3b794ef6ab379c57a6312479"><h4 class="sectiontitle">Keywords</h4><p id="dli_08_0124__en-us_topic_0114776218_en-us_topic_0114689143_p33843242274">LIMIT is used to limit the query results. Only INT type is supported by the <strong id="dli_08_0124__en-us_topic_0093946751_b842352706163741">number</strong> parameter.</p>
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</div>
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<div class="section" id="dli_08_0124__en-us_topic_0114776218_en-us_topic_0114689143_sd02019d1afd4479d811d4fc5cb2be648"><h4 class="sectiontitle">Precautions</h4><p id="dli_08_0124__en-us_topic_0114776218_en-us_topic_0114689143_p142454394292">The table to be queried must exist. Otherwise, an error is reported.</p>
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</div>
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<div class="section" id="dli_08_0124__en-us_topic_0114776218_en-us_topic_0114689143_s18c3289e82d94522b31bbdc7d2aae3ed"><h4 class="sectiontitle">Example</h4><p id="dli_08_0124__en-us_topic_0114776218_en-us_topic_0114689143_ab3da007974a548888c2e36ddd6e01c43">Query data in the <strong id="dli_08_0124__b013201814480">opentsdb_table</strong> table.</p>
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<div class="codecoloring" codetype="Sql" id="dli_08_0124__en-us_topic_0114776218_screen8520818164513"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">opentsdb_table</span><span class="w"> </span><span class="k">limit</span><span class="w"> </span><span class="mi">100</span><span class="p">;</span>
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</pre></div></td></tr></table></div>
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</div>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dli_08_0220.html">Creating a Datasource Connection with an OpenTSDB Table</a></div>
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</div>
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</div>
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