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Lu, Huayi e6fa411af0 DWS DEV 830.201 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: Lu, Huayi <luhuayi@huawei.com>
Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
2024-05-16 07:24:04 +00:00

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<a name="EN-US_TOPIC_0000001233628637"></a><a name="EN-US_TOPIC_0000001233628637"></a>
<h1 class="topictitle1">COMMENT</h1>
<div id="body8662426"><div class="section" id="EN-US_TOPIC_0000001233628637__s9bda7e80875146e3868eaa25039140f1"><h4 class="sectiontitle">Function</h4><p id="EN-US_TOPIC_0000001233628637__p172689572135"><strong id="EN-US_TOPIC_0000001233628637__b139995119411">COMMENT</strong> defines or changes the comment of an object.</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001233628637__s2ec5e3434a504f71a92afb137372e512"><h4 class="sectiontitle">Precautions</h4><ul id="EN-US_TOPIC_0000001233628637__ul153514440147"><li id="EN-US_TOPIC_0000001233628637__li1535124416149">Only one comment string is stored for each object. To modify a comment, issue a new <strong id="EN-US_TOPIC_0000001233628637__b1677317161048">COMMENT</strong> command for the same object. To remove a comment, write <strong id="EN-US_TOPIC_0000001233628637__b842352706145356">NULL</strong> in place of the text string. Comments are automatically deleted when their objects are deleted.</li><li id="EN-US_TOPIC_0000001233628637__li653517447142">Currently, there is no security protection for viewing comments. Any user connected to a database can view all the comments for objects in the database. For shared objects such as databases, roles, and tablespaces, comments are stored globally so any user connected to any database in the cluster can see all the comments for shared objects. Therefore, do not put security-critical information in comments.</li><li id="EN-US_TOPIC_0000001233628637__li1535174419141">For most kinds of objects, only the owner of objects can set the comment. Roles do not have owners, so the rule for <strong id="EN-US_TOPIC_0000001233628637__b84235270616287">COMMENT ON ROLE</strong> is that you must be administrator to comment on an administrator role, or have the <strong id="EN-US_TOPIC_0000001233628637__b9266157171015">CREATE ROLE</strong> permission to comment on non-administrator roles. An administrator can comment on anything.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0000001233628637__s64cd8bcf7e7b4192b425c80cfc277e64"><h4 class="sectiontitle">Syntax</h4><div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233628637__s136b736ae32d4595b917fb2702a5d317"><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>
<span class="normal">25</span>
<span class="normal">26</span>
<span class="normal">27</span>
<span class="normal">28</span>
<span class="normal">29</span>
<span class="normal">30</span>
<span class="normal">31</span>
<span class="normal">32</span>
<span class="normal">33</span>
<span class="normal">34</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">COMMENT</span><span class="w"> </span><span class="k">ON</span>
<span class="err">{</span>
<span class="w"> </span><span class="k">AGGREGATE</span><span class="w"> </span><span class="n">agg_name</span><span class="w"> </span><span class="p">(</span><span class="n">agg_type</span><span class="w"> </span><span class="p">[,</span><span class="w"> </span><span class="p">...]</span><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">CAST</span><span class="w"> </span><span class="p">(</span><span class="n">source_type</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="n">target_type</span><span class="p">)</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">COLLATION</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="err">{</span><span class="w"> </span><span class="k">table_name</span><span class="p">.</span><span class="k">column_name</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">view_name</span><span class="p">.</span><span class="k">column_name</span><span class="w"> </span><span class="err">}</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">CONSTRAINT</span><span class="w"> </span><span class="k">constraint_name</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="k">table_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">CONVERSION</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">DATABASE</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">DOMAIN</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="n">EXTENSION</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">FOREIGN</span><span class="w"> </span><span class="k">DATA</span><span class="w"> </span><span class="n">WRAPPER</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">FOREIGN</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">FUNCTION</span><span class="w"> </span><span class="n">function_name</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="p">[</span><span class="w"> </span><span class="err">{</span><span class="p">[</span><span class="w"> </span><span class="n">argmode</span><span class="w"> </span><span class="p">]</span><span class="w"> </span><span class="p">[</span><span class="w"> </span><span class="n">argname</span><span class="w"> </span><span class="p">]</span><span class="w"> </span><span class="n">argtype</span><span class="err">}</span><span class="w"> </span><span class="p">[,</span><span class="w"> </span><span class="p">...]</span><span class="w"> </span><span class="p">]</span><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">LARGE</span><span class="w"> </span><span class="k">OBJECT</span><span class="w"> </span><span class="n">large_object_oid</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">OPERATOR</span><span class="w"> </span><span class="n">operator_name</span><span class="w"> </span><span class="p">(</span><span class="n">left_type</span><span class="p">,</span><span class="w"> </span><span class="n">right_type</span><span class="p">)</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">OPERATOR</span><span class="w"> </span><span class="k">CLASS</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="k">USING</span><span class="w"> </span><span class="n">index_method</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">OPERATOR</span><span class="w"> </span><span class="n">FAMILY</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="k">USING</span><span class="w"> </span><span class="n">index_method</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="p">[</span><span class="w"> </span><span class="k">PROCEDURAL</span><span class="w"> </span><span class="p">]</span><span class="w"> </span><span class="k">LANGUAGE</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">ROLE</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">RULE</span><span class="w"> </span><span class="n">rule_name</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="k">table_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">SCHEMA</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="n">SERVER</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="n">TABLESPACE</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="nb">TEXT</span><span class="w"> </span><span class="k">SEARCH</span><span class="w"> </span><span class="n">CONFIGURATION</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="nb">TEXT</span><span class="w"> </span><span class="k">SEARCH</span><span class="w"> </span><span class="k">DICTIONARY</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="nb">TEXT</span><span class="w"> </span><span class="k">SEARCH</span><span class="w"> </span><span class="n">PARSER</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="nb">TEXT</span><span class="w"> </span><span class="k">SEARCH</span><span class="w"> </span><span class="k">TEMPLATE</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">TYPE</span><span class="w"> </span><span class="n">object_name</span><span class="w"> </span><span class="o">|</span>
<span class="w"> </span><span class="k">VIEW</span><span class="w"> </span><span class="n">object_name</span>
<span class="err">}</span>
<span class="w"> </span><span class="k">IS</span><span class="w"> </span><span class="s1">'text'</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001233628637__s4036dc25a2414f0aa4c337a7d888adb8"><h4 class="sectiontitle">Parameter Description</h4><ul id="EN-US_TOPIC_0000001233628637__u594cc9bdfd8d4538a2897d5602f9bcb9"><li id="EN-US_TOPIC_0000001233628637__l09588b9980464453b743608c9b271cb2"><strong id="EN-US_TOPIC_0000001233628637__af661bcc9a8664966b1850ff19022b07e">agg_name</strong><p id="EN-US_TOPIC_0000001233628637__a66ff0b4a237c418e9bce340bcede4943">Specifies the new name of an aggregation function.</p>
</li><li id="EN-US_TOPIC_0000001233628637__lbc1fb8c19a8c425fb85957c2430f7db3"><strong id="EN-US_TOPIC_0000001233628637__a6c48acfe038a4e8499f2b15c2dfba632">agg_type</strong><p id="EN-US_TOPIC_0000001233628637__a564bcac335154e10bad06c578da64921">Specifies the data types of the aggregation function parameters.</p>
</li><li id="EN-US_TOPIC_0000001233628637__l612b870c9ffb46e4bb35dc608d448cc3"><strong id="EN-US_TOPIC_0000001233628637__a9fd7bdb33c454411aefa1d7bee87d6f6">source_type</strong><p id="EN-US_TOPIC_0000001233628637__a44b18e9f350e4076be0cac518828f9aa">Specifies the name of the source data type of the cast.</p>
</li><li id="EN-US_TOPIC_0000001233628637__lb8e0ac5455624b319ace17d9290953e6"><strong id="EN-US_TOPIC_0000001233628637__a632c7face00041ad8bbabf1697608f77">target_type</strong><p id="EN-US_TOPIC_0000001233628637__ab60b5d81043240ad81b7c3f636c470d9">Specifies the name of the target data type of the cast.</p>
</li><li id="EN-US_TOPIC_0000001233628637__l4fe12e3759bb4ee091e7305f233134c1"><strong id="EN-US_TOPIC_0000001233628637__a9ba73fe2ae5a4989bcd7dcf833df307e">object_name</strong><p id="EN-US_TOPIC_0000001233628637__ace8d4dc5f8a24c7d94f1ece91812bda6">Specifies the name of the object to be commented.</p>
</li><li id="EN-US_TOPIC_0000001233628637__ld75364e85a884b709c51fdc1e9bab661"><strong id="EN-US_TOPIC_0000001233628637__abfb05b0e0fc6418496f8f34f04dcaa2e">table_name.column_name</strong><p id="EN-US_TOPIC_0000001233628637__a98850e3bb942453ea107fb91b52b2783"><strong id="EN-US_TOPIC_0000001233628637__a13dd2f9ad05d4932bf9fd83c3ddffe99">view_name.column_name</strong></p>
<p id="EN-US_TOPIC_0000001233628637__a37bbc76733974bb78546f65a16bcab96">Specifies the column whose comment is defined or modified. You can add the table name or view name as the prefix.</p>
</li><li id="EN-US_TOPIC_0000001233628637__l9e483bc3b9ca4258b0d0dd7dc5ec479e"><strong id="EN-US_TOPIC_0000001233628637__a740c35614e174df5815bd8f062d1331d">constraint_name</strong><p id="EN-US_TOPIC_0000001233628637__a797ea8f25e9c4cbda30220676fb1d271">Specifies the table constraints whose comment is defined or modified.</p>
</li><li id="EN-US_TOPIC_0000001233628637__lb046863795374ac7b589c5c17badca36"><strong id="EN-US_TOPIC_0000001233628637__a4ed8b111f6804a6ab382ba33e97d415d">table_name</strong><p id="EN-US_TOPIC_0000001233628637__addda9cfde7a04c75bdabbf622ec92a2c">Specifies the table name.</p>
</li><li id="EN-US_TOPIC_0000001233628637__l9377eec57d3342cbaed2b914b88bae33"><strong id="EN-US_TOPIC_0000001233628637__ae1d60f4c1d9c4061bf7de7b342a53193">function_name</strong><p id="EN-US_TOPIC_0000001233628637__ab52dbbc75e474e6bba18916fb56d4724">Specifies the function whose comment is defined or modified.</p>
</li><li id="EN-US_TOPIC_0000001233628637__l95239f9af220449bb57c2def021e8503"><strong id="EN-US_TOPIC_0000001233628637__a3a94d22ecfd04b828cc7d3053cd1b1db">argmode,argname,argtype</strong><p id="EN-US_TOPIC_0000001233628637__aff24089a4aae4736a98f13524fd8fc5b">Specifies the schema, name, and type of the function parameters.</p>
</li><li id="EN-US_TOPIC_0000001233628637__l3afd714a080844afaa269eafd0e32743"><strong id="EN-US_TOPIC_0000001233628637__a24fabd0068ad4f088331acfd5c897c57">large_object_oid</strong><p id="EN-US_TOPIC_0000001233628637__a204be5795866491e9d41dc4d00b67476">Specifies the OID of the large object whose comment is defined or modified.</p>
</li><li id="EN-US_TOPIC_0000001233628637__l51790694056b4f629095a4ada9ccb8a7"><strong id="EN-US_TOPIC_0000001233628637__addd064900d8b48bd97dfee085d0a779b">operator_name</strong><p id="EN-US_TOPIC_0000001233628637__a51842418a28a4b5787221086a33f56ce">Specifies the name of the operator.</p>
</li><li id="EN-US_TOPIC_0000001233628637__l3dbf8568f442462d8973c9d7802bc812"><strong id="EN-US_TOPIC_0000001233628637__a613e4b43c07f4ed99966c9b9115f008e">left_type,right_type</strong><p id="EN-US_TOPIC_0000001233628637__a573be116475e4b35beb5114ed1b622c7">The data type(s) of the operator's arguments (optionally schema-qualified). Write NONE for the missing argument of a prefix or postfix operator.</p>
</li><li id="EN-US_TOPIC_0000001233628637__l0afb1a1e1d3d492e85bc762bbbbdf375"><strong id="EN-US_TOPIC_0000001233628637__a3c92d8bff4e44e5fafb0643e410b85ed">text</strong><p id="EN-US_TOPIC_0000001233628637__acffa06abbc624678bf8bebc742618262">Specifies the new comment, written as a string literal; or <strong id="EN-US_TOPIC_0000001233628637__b84235270684556">NULL</strong> to drop the comment.</p>
</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0000001233628637__s7a62b515c165414cb0a8433d87853a49"><h4 class="sectiontitle">Examples</h4><p id="EN-US_TOPIC_0000001233628637__p139591215154810">Create a table:</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233628637__screen824712315720"><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></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="n">CUSTOMER</span>
<span class="p">(</span><span class="w"> </span>
<span class="w"> </span><span class="n">C_CUSTKEY</span><span class="w"> </span><span class="nb">BIGINT</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">CONSTRAINT</span><span class="w"> </span><span class="n">C_CUSTKEY_pk</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="w"> </span>
<span class="w"> </span><span class="n">C_NAME</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">25</span><span class="p">)</span><span class="w"> </span><span class="p">,</span><span class="w"> </span>
<span class="w"> </span><span class="n">C_ADDRESS</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">40</span><span class="p">)</span><span class="w"> </span><span class="p">,</span><span class="w"> </span>
<span class="w"> </span><span class="n">C_NATIONKEY</span><span class="w"> </span><span class="nb">INT</span><span class="w"> </span><span class="p">,</span><span class="w"> </span>
<span class="w"> </span><span class="n">C_PHONE</span><span class="w"> </span><span class="nb">CHAR</span><span class="p">(</span><span class="mi">15</span><span class="p">)</span><span class="w"> </span><span class="p">,</span><span class="w"> </span>
<span class="w"> </span><span class="n">C_ACCTBAL</span><span class="w"> </span><span class="nb">DECIMAL</span><span class="p">(</span><span class="mi">15</span><span class="p">,</span><span class="mi">2</span><span class="p">)</span><span class="w"> </span>
<span class="p">)</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="p">(</span><span class="n">C_CUSTKEY</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001233628637__p17211141517529">Add a comment to the <strong id="EN-US_TOPIC_0000001233628637__b1581238833257">customer.c_customer_sk</strong> column.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233628637__screen5325182620530"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">COMMENT</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="n">customer</span><span class="p">.</span><span class="n">C_CUSTKEY</span><span class="w"> </span><span class="k">IS</span><span class="w"> </span><span class="s1">'Primary key of customer demographics table.'</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001233628637__p1687614614812">Create a view</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233628637__screen139101035195715"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">OR</span><span class="w"> </span><span class="k">REPLACE</span><span class="w"> </span><span class="k">VIEW</span><span class="w"> </span><span class="n">customer_details_view</span><span class="w"> </span><span class="k">AS</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">CUSTOMER</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001233628637__p2021141517523">Add a comment to the <strong id="EN-US_TOPIC_0000001233628637__b138664973133257">customer_details_view</strong> view:</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233628637__screen9330830569"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">COMMENT</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="k">VIEW</span><span class="w"> </span><span class="n">customer_details_view</span><span class="w"> </span><span class="k">IS</span><span class="w"> </span><span class="s1">'View of customer detail'</span><span class="p">;</span>
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<p id="EN-US_TOPIC_0000001233628637__p1617805220538">Add a comment to the <strong id="EN-US_TOPIC_0000001233628637__b47548744033257">customer</strong> table.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233628637__screen4155755145512"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">COMMENT</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">customer</span><span class="w"> </span><span class="k">IS</span><span class="w"> </span><span class="s1">'This is my table'</span><span class="p">;</span>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_06_0118.html">DDL Syntax</a></div>
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