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@ -107,4 +107,4 @@ GROUP BY location, type </code></pre>
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FROM thermometer
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WHERE name<>'beijing' and ts>=now-1d
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INTERVAL(10M)
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GROUP BY location, type</code></pre><a href='../index.html'>回去</a></section></main></div><?php include($s.'/footer.php'); ?><script>$('pre').addClass('prettyprint linenums');PR.prettyPrint()</script><script src='lib/docs/liner.js'></script></body></html>
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GROUP BY location, type</code></pre><a href='../index.html'>回去</a></section></main></div><?php include($s.'/footer.php'); ?><script>$('pre').addClass('prettyprint linenums');PR.prettyPrint()</script><script src='lib/docs/liner.js'></script></body></html>
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@ -92,4 +92,4 @@ INTERVAL(10M)</code></pre>
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<p>It changes the name of a tag from old to new. </p>
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<a class='anchor' id='Change-the-Tag's-Value'></a><h3>Change the Tag's Value</h3>
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<pre><code class="mysql language-mysql">ALTER TABLE <table_name> SET TAG <tag_name>=<new_tag_value></code></pre>
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<p>It changes a table's tag value to a new one. </p><a href='../index.html'>Back</a></section></main></div><?php include($s.'/footer.php'); ?><script>$('pre').addClass('prettyprint linenums');PR.prettyPrint()</script><script src='lib/docs/liner.js'></script></body></html>
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<p>It changes a table's tag value to a new one. </p><a href='../index.html'>Back</a></section></main></div><?php include($s.'/footer.php'); ?><script>$('pre').addClass('prettyprint linenums');PR.prettyPrint()</script><script src='lib/docs/liner.js'></script></body></html>
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@ -41,7 +41,7 @@ TDengine对表的主键(时间戳)建立索引,暂时不提供针对数据
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STable从属于库,一个STable只属于一个库,但一个库可以有一到多个STable, 一个STable可有多个子表。
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## 超级表管理
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## 超级表管理
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- 创建超级表
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@ -1,4 +1,4 @@
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# STable: Super Table
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# STable: Super Table
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"One Table for One Device" design can improve the insert/query performance significantly for a single device. But it has a side effect, the aggregation of multiple tables becomes hard. To reduce the complexity and improve the efficiency, TDengine introduced a new concept: STable (Super Table).
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