提交 b3cb1e20 编写于 作者: H Hongze Cheng

change commit message

上级 148b7835
......@@ -107,4 +107,4 @@ GROUP BY location, type </code></pre>
FROM thermometer
WHERE name&lt;&gt;'beijing' and ts&gt;=now-1d
INTERVAL(10M)
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>
......@@ -92,4 +92,4 @@ INTERVAL(10M)</code></pre>
<p>It changes the name of a tag from old to new. </p>
<a class='anchor' id='Change-the-Tag's-Value'></a><h3>Change the Tag's Value</h3>
<pre><code class="mysql language-mysql">ALTER TABLE &lt;table_name&gt; SET TAG &lt;tag_name&gt;=&lt;new_tag_value&gt;</code></pre>
<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>
......@@ -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
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。
## 超级表管理
## 超级表管理
- 创建超级表
......
# STable: Super Table
# STable: Super Table
"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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