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<h1>SQL 撤销索引、撤销表以及撤销数据库 </h1>
<p class="intro">通过使用 DROP 语句，可以轻松地删除索引、表和数据库。</p> <h2>DROP INDEX 语句</h2> <p>DROP INDEX 语句用于删除表中的索引。</p> <h3>用于 MS Access 的 DROP INDEX 语法：</h3> <div class="code notranslate"><pre><div> DROP INDEX index_name ON table_name</div></pre></div> <h3>用于 MS SQL Server 的 DROP INDEX 语法：</h3> <div class="code notranslate"><pre><div> DROP INDEX table_name.index_name</div></pre></div> <h3>用于 DB2/Oracle 的 DROP INDEX 语法：</h3> <div class="code notranslate"><pre><div> DROP INDEX index_name</div></pre></div> <h3>用于 MySQL 的 DROP INDEX 语法：</h3> <div class="code notranslate"><pre><div> ALTER TABLE table_name DROP INDEX index_name</div></pre></div> <h2>DROP TABLE 语句</h2> <p>DROP TABLE 语句用于删除表。</p> <div class="code notranslate"><pre><div> DROP TABLE table_name</div></pre></div> <h2>DROP DATABASE 语句</h2> <p>DROP DATABASE 语句用于删除数据库。</p> <div class="code notranslate"><pre><div> DROP DATABASE database_name</div></pre></div> <h2>TRUNCATE TABLE 语句</h2> <p>如果我们仅仅需要删除表内的数据，但并不删除表本身，那么我们该如何做呢？</p> <p>请使用 TRUNCATE TABLE 语句：</p> <div class="code notranslate"><pre><div> TRUNCATE TABLE table_name</div></pre></div> <br/><div class="text-center padding-10 margin-t-5">
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