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Lu, Huayi 95132e24fc DWS UMN 830.201_new version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Reviewed-by: Rechenburg, Matthias <matthias.rechenburg@t-systems.com>
Co-authored-by: Lu, Huayi <luhuayi@huawei.com>
Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
2024-05-27 11:54:34 +00:00

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<a name="EN-US_TOPIC_0000001330329172"></a><a name="EN-US_TOPIC_0000001330329172"></a>
<h1 class="topictitle1">What Do I Do If Date Type Is Automatically Converted to the Timestamp Type During Table Creation?</h1>
<div id="body0000001330329172"><p id="EN-US_TOPIC_0000001330329172__p1523773216382">When creating a database, you can set the <strong id="EN-US_TOPIC_0000001330329172__b6902243787440">DBCOMPATIBILITY</strong> parameter to the compatible database type. The value of <strong id="EN-US_TOPIC_0000001330329172__b4212286807440">DBCOMPATIBILITY</strong> can be <strong id="EN-US_TOPIC_0000001330329172__b13398779697440">ORA</strong>, <strong id="EN-US_TOPIC_0000001330329172__b5590077527440">TD</strong>, and <strong id="EN-US_TOPIC_0000001330329172__b3881791887440">MySQL</strong>, indicating Oracle, Teradata, and MySQL databases, respectively. If this parameter is not specified during database creation, the default value <strong id="EN-US_TOPIC_0000001330329172__b11529135907440">ORA</strong> is used. In ORA compatibility mode, the date type is automatically converted to timestamp(0). The date type is only supported in the MySQL compatibility mode.</p>
<p id="EN-US_TOPIC_0000001330329172__p112515234010">To solve the problem, you need to change the compatibility mode to MySQL. The compatibility mode of an existing database cannot be changed. It can only be specified during creation of the database. GaussDB(DWS) supports the MySQL compatibility mode in cluster version 8.1.1 and later. To configure this mode, run the following commands:</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001330329172__screen1865124753017"><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></pre></div></td><td class="code"><div><pre><span></span><span class="n">gaussdb</span><span class="o">=&gt;</span><span class="w"> </span><span class="k">CREATE</span><span class="w"> </span><span class="k">DATABASE</span><span class="w"> </span><span class="n">mydatabase</span><span class="w"> </span><span class="n">DBCOMPATIBILITY</span><span class="o">=</span><span class="s1">'mysql'</span><span class="p">;</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">DATABASE</span>
<span class="n">gaussdb</span><span class="o">=&gt;</span><span class="w"> </span><span class="err">\</span><span class="k">c</span><span class="w"> </span><span class="n">mydatabase</span>
<span class="n">Non</span><span class="o">-</span><span class="n">SSL</span><span class="w"> </span><span class="k">connection</span><span class="w"> </span><span class="p">(</span><span class="n">SSL</span><span class="w"> </span><span class="k">connection</span><span class="w"> </span><span class="k">is</span><span class="w"> </span><span class="n">recommended</span><span class="w"> </span><span class="k">when</span><span class="w"> </span><span class="n">requiring</span><span class="w"> </span><span class="n">high</span><span class="o">-</span><span class="k">security</span><span class="p">)</span>
<span class="n">You</span><span class="w"> </span><span class="k">are</span><span class="w"> </span><span class="n">now</span><span class="w"> </span><span class="n">connected</span><span class="w"> </span><span class="k">to</span><span class="w"> </span><span class="k">database</span><span class="w"> </span><span class="ss">&quot;mydatabase&quot;</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="k">user</span><span class="w"> </span><span class="ss">&quot;dbadmin&quot;</span><span class="p">.</span>
<span class="n">mydatabase</span><span class="o">=&gt;</span><span class="w"> </span><span class="k">create</span><span class="w"> </span><span class="k">table</span><span class="w"> </span><span class="n">t1</span><span class="p">(</span><span class="n">c1</span><span class="w"> </span><span class="nb">int</span><span class="p">,</span><span class="w"> </span><span class="n">c2</span><span class="w"> </span><span class="nb">date</span><span class="p">);</span>
<span class="n">NOTICE</span><span class="p">:</span><span class="w"> </span><span class="n">The</span><span class="w"> </span><span class="s1">'DISTRIBUTE BY'</span><span class="w"> </span><span class="n">clause</span><span class="w"> </span><span class="k">is</span><span class="w"> </span><span class="k">not</span><span class="w"> </span><span class="n">specified</span><span class="p">.</span><span class="w"> </span><span class="k">Using</span><span class="w"> </span><span class="n">round</span><span class="o">-</span><span class="n">robin</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="n">the</span><span class="w"> </span><span class="n">distribution</span><span class="w"> </span><span class="k">mode</span><span class="w"> </span><span class="k">by</span><span class="w"> </span><span class="k">default</span><span class="p">.</span>
<span class="n">HINT</span><span class="p">:</span><span class="w"> </span><span class="n">Please</span><span class="w"> </span><span class="n">use</span><span class="w"> </span><span class="s1">'DISTRIBUTE BY'</span><span class="w"> </span><span class="n">clause</span><span class="w"> </span><span class="k">to</span><span class="w"> </span><span class="n">specify</span><span class="w"> </span><span class="n">suitable</span><span class="w"> </span><span class="k">data</span><span class="w"> </span><span class="n">distribution</span><span class="w"> </span><span class="k">column</span><span class="p">.</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001330329172__p19287182616365">If the problem cannot be solved by changing the compatibility, you can try to change the column type. For example, insert data of the date type as trings into a table. Example:</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001330329172__screen98762414447"><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></pre></div></td><td class="code"><div><pre><span></span><span class="n">gaussdb</span><span class="o">=&gt;</span><span class="w"> </span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">mytable</span><span class="w"> </span><span class="p">(</span><span class="n">a</span><span class="w"> </span><span class="nb">date</span><span class="p">,</span><span class="n">b</span><span class="w"> </span><span class="nb">int</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span>
<span class="n">gaussdb</span><span class="o">=&gt;</span><span class="w"> </span><span class="k">INSERT</span><span class="w"> </span><span class="k">INTO</span><span class="w"> </span><span class="n">mytable</span><span class="w"> </span><span class="k">VALUES</span><span class="p">(</span><span class="nb">date</span><span class="w"> </span><span class="s1">'12-08-2023'</span><span class="p">,</span><span class="mi">01</span><span class="p">);</span>
<span class="k">INSERT</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="mi">1</span>
<span class="n">gaussdb</span><span class="o">=&gt;</span><span class="w"> </span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">mytable</span><span class="p">;</span>
<span class="w"> </span><span class="n">a</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">b</span>
<span class="c1">---------------------+---</span>
<span class="w"> </span><span class="mi">2023</span><span class="o">-</span><span class="mi">12</span><span class="o">-</span><span class="mi">08</span><span class="w"> </span><span class="mi">00</span><span class="p">:</span><span class="mi">00</span><span class="p">:</span><span class="mi">00</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">1</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
<span class="n">gaussdb</span><span class="o">=&gt;</span><span class="w"> </span><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">mytable</span><span class="w"> </span><span class="k">MODIFY</span><span class="w"> </span><span class="n">a</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">20</span><span class="p">);</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span>
<span class="n">gaussdb</span><span class="o">=&gt;</span><span class="w"> </span><span class="k">INSERT</span><span class="w"> </span><span class="k">INTO</span><span class="w"> </span><span class="n">mytable</span><span class="w"> </span><span class="k">VALUES</span><span class="p">(</span><span class="s1">'2023-12-10'</span><span class="p">,</span><span class="mi">02</span><span class="p">);</span>
<span class="k">INSERT</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="mi">1</span>
<span class="n">gaussdb</span><span class="o">=&gt;</span><span class="w"> </span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">mytable</span><span class="p">;</span>
<span class="w"> </span><span class="n">a</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">b</span>
<span class="c1">---------------------+---</span>
<span class="w"> </span><span class="mi">2023</span><span class="o">-</span><span class="mi">12</span><span class="o">-</span><span class="mi">08</span><span class="w"> </span><span class="mi">00</span><span class="p">:</span><span class="mi">00</span><span class="p">:</span><span class="mi">00</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">1</span>
<span class="w"> </span><span class="mi">2023</span><span class="o">-</span><span class="mi">12</span><span class="o">-</span><span class="mi">10</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="mi">2</span>
<span class="p">(</span><span class="mi">2</span><span class="w"> </span><span class="k">rows</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_03_0065.html">Database Usage</a></div>
</div>
</div>
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