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<h1 class="topictitle1">LOCK</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001813439132__en-us_topic_0000001385456454_en-us_topic_0214164681_p102116541238">GaussDB(DWS) does not support the <strong id="EN-US_TOPIC_0000001813439132__en-us_topic_0000001385456454_b956419239454">ALTER TABLE </strong><em id="EN-US_TOPIC_0000001813439132__en-us_topic_0000001385456454_i18564182364517">tbName </em><strong id="EN-US_TOPIC_0000001813439132__en-us_topic_0000001385456454_b656515233451">LOCK</strong> statement of MySQL, which will be deleted by DSC during migration.</p>
<p id="EN-US_TOPIC_0000001813439132__en-us_topic_0000001385456454_en-us_topic_0214164681_p896271452516"><strong id="EN-US_TOPIC_0000001813439132__en-us_topic_0000001385456454_en-us_topic_0214164681_b3964329102518">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813439132__en-us_topic_0000001385456454_en-us_topic_0214164681_screen267624012514"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span>
<span class="normal">12</span>
<span class="normal">13</span>
<span class="normal">14</span>
<span class="normal">15</span>
<span class="normal">16</span>
<span class="normal">17</span>
<span class="normal">18</span>
<span class="normal">19</span>
<span class="normal">20</span>
<span class="normal">21</span>
<span class="normal">22</span>
<span class="normal">23</span>
<span class="normal">24</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="k">IF</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">EXISTS</span><span class="w"> </span><span class="o">`</span><span class="n">runoob_alter_test</span><span class="o">`</span><span class="p">(</span>
<span class="w">    </span><span class="o">`</span><span class="n">dataType1</span><span class="o">`</span><span class="w"> </span><span class="nb">int</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="n">AUTO_INCREMENT</span><span class="p">,</span>
<span class="w">    </span><span class="o">`</span><span class="n">dataType2</span><span class="o">`</span><span class="w"> </span><span class="nb">FLOAT</span><span class="p">(</span><span class="mi">10</span><span class="p">),</span>
<span class="w">    </span><span class="o">`</span><span class="n">dataType4</span><span class="o">`</span><span class="w"> </span><span class="nb">TEXT</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w">    </span><span class="o">`</span><span class="n">dataType5</span><span class="o">`</span><span class="w"> </span><span class="k">YEAR</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">'2018'</span><span class="p">,</span>
<span class="w">    </span><span class="o">`</span><span class="n">dataType6</span><span class="o">`</span><span class="w"> </span><span class="n">DATETIME</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w">    </span><span class="o">`</span><span class="n">dataType7</span><span class="o">`</span><span class="w"> </span><span class="nb">CHAR</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">''</span><span class="p">,</span>
<span class="w">    </span><span class="o">`</span><span class="n">dataType8</span><span class="o">`</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">50</span><span class="p">),</span>
<span class="w">    </span><span class="o">`</span><span class="n">dataType9</span><span class="o">`</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">50</span><span class="p">)</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">''</span><span class="p">,</span>
<span class="w">    </span><span class="o">`</span><span class="n">dataType10</span><span class="o">`</span><span class="w"> </span><span class="k">TIME</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">'10:20:59'</span><span class="p">,</span>
<span class="w">    </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="p">(</span><span class="o">`</span><span class="n">dataType1</span><span class="o">`</span><span class="p">)</span>
<span class="p">)</span><span class="n">ENGINE</span><span class="o">=</span><span class="n">InnoDB</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="n">CHARSET</span><span class="o">=</span><span class="n">utf8</span><span class="p">;</span>

<span class="o">##</span><span class="w"> </span><span class="n">A</span><span class="p">.</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">LOCK</span><span class="w"> </span><span class="k">DEFAULT</span><span class="p">;</span>

<span class="o">##</span><span class="w"> </span><span class="n">B</span><span class="p">.</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">LOCK</span><span class="o">=</span><span class="k">DEFAULT</span><span class="p">;</span>

<span class="o">##</span><span class="w"> </span><span class="k">C</span><span class="p">.</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">LOCK</span><span class="w"> </span><span class="k">EXCLUSIVE</span><span class="p">;</span>

<span class="o">##</span><span class="w"> </span><span class="n">D</span><span class="p">.</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">LOCK</span><span class="o">=</span><span class="k">EXCLUSIVE</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813439132__en-us_topic_0000001385456454_en-us_topic_0214164681_p10469192052519"><strong id="EN-US_TOPIC_0000001813439132__en-us_topic_0000001385456454_en-us_topic_0214164681_b920583352516">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813439132__en-us_topic_0000001385456454_en-us_topic_0214164681_screen12559134312512"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span>
<span class="normal">12</span>
<span class="normal">13</span>
<span class="normal">14</span>
<span class="normal">15</span>
<span class="normal">16</span>
<span class="normal">17</span>
<span class="normal">18</span>
<span class="normal">19</span>
<span class="normal">20</span>
<span class="normal">21</span>
<span class="normal">22</span>
<span class="normal">23</span>
<span class="normal">24</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="k">IF</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">EXISTS</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span>
<span class="p">(</span>
<span class="w">  </span><span class="ss">&quot;datatype1&quot;</span><span class="w"> </span><span class="nb">SERIAL</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w">  </span><span class="ss">&quot;datatype2&quot;</span><span class="w"> </span><span class="nb">REAL</span><span class="p">,</span>
<span class="w">  </span><span class="ss">&quot;datatype4&quot;</span><span class="w"> </span><span class="nb">TEXT</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w">  </span><span class="ss">&quot;datatype5&quot;</span><span class="w"> </span><span class="nb">SMALLINT</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">'2018'</span><span class="p">,</span>
<span class="w">  </span><span class="ss">&quot;datatype6&quot;</span><span class="w"> </span><span class="k">TIMESTAMP</span><span class="w"> </span><span class="k">WITHOUT</span><span class="w"> </span><span class="k">TIME</span><span class="w"> </span><span class="k">ZONE</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w">  </span><span class="ss">&quot;datatype7&quot;</span><span class="w"> </span><span class="nb">CHAR</span><span class="p">(</span><span class="mi">4</span><span class="p">)</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">''</span><span class="p">,</span>
<span class="w">  </span><span class="ss">&quot;datatype8&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">200</span><span class="p">),</span>
<span class="w">  </span><span class="ss">&quot;datatype9&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">200</span><span class="p">)</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">''</span><span class="p">,</span>
<span class="w">  </span><span class="ss">&quot;datatype10&quot;</span><span class="w"> </span><span class="k">TIME</span><span class="w"> </span><span class="k">WITHOUT</span><span class="w"> </span><span class="k">TIME</span><span class="w"> </span><span class="k">ZONE</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">'10:20:59'</span><span class="p">,</span>
<span class="w">  </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype1&quot;</span><span class="p">)</span>
<span class="p">)</span>
<span class="w">  </span><span class="k">WITH</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="n">ORIENTATION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">ROW</span><span class="p">,</span><span class="w"> </span><span class="n">COMPRESSION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">NO</span><span class="w"> </span><span class="p">)</span>
<span class="w">  </span><span class="n">NOCOMPRESS</span>
<span class="w">  </span><span class="n">DISTRIBUTE</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">HASH</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype1&quot;</span><span class="p">);</span>

<span class="c1">-- A.</span>

<span class="c1">-- B.</span>

<span class="c1">-- C.</span>

<span class="c1">-- D.</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813439132__en-us_topic_0000001385456454_en-us_topic_0214164681_p8060118"></p>
</div>
<div>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_16_0119.html">Table (Optional Parameters and Operations)</a></div>
</div>
</div>