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doc: mysql.md modify column (#98) d8a37d084f

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jaywcjlove
2022-11-16 04:58:18 +00:00
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@ -212,6 +212,9 @@
<p>将列c1重命名为c2</p>
<pre class="language-sql"><code class="language-sql code-highlight"><span class="code-line"><span class="token keyword">ALTER</span> <span class="token keyword">TABLE</span> t1 <span class="token keyword">RENAME</span> c1 <span class="token keyword">TO</span> c2 <span class="token punctuation">;</span>
</span></code></pre>
<p>将列c1的数据类型改为datatype</p>
<pre class="language-sql"><code class="language-sql code-highlight"><span class="code-line"><span class="token keyword">ALTER</span> <span class="token keyword">TABLE</span> t1 <span class="token keyword">MODIFY</span> c1 datatype<span class="token punctuation">;</span>
</span></code></pre>
<p>删除表中的所有数据</p>
<pre class="language-sql"><code class="language-sql code-highlight"><span class="code-line"><span class="token keyword">TRUNCATE</span> <span class="token keyword">TABLE</span> t<span class="token punctuation">;</span>
</span></code></pre>