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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_0000001233430175"></a><a name="EN-US_TOPIC_0000001233430175"></a>
<h1 class="topictitle1">ALTER REDACTION POLICY</h1>
<div id="body0000001125199825"><div class="section" id="EN-US_TOPIC_0000001233430175__se1c3f486ddc249bf88a6665ebb1755f8"><h4 class="sectiontitle">Function</h4><p id="EN-US_TOPIC_0000001233430175__a2252e8d6585640c2a961739f92bab925"><strong id="EN-US_TOPIC_0000001233430175__b69811711142210">ALTER REDACTION POLICY</strong> modifies a data redaction policy applied to a specified table.</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001233430175__s45e5bcb791ea44aea14d5f73d6f0f95c"><h4 class="sectiontitle">Precautions</h4><p id="EN-US_TOPIC_0000001233430175__ab968098694574d398abccd639f568bbf">Only the owner of the table to which the redaction policy is applied has the permission to modify the redaction policy.</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001233430175__sb962574e3aca4aa293b4b146573d5cda"><h4 class="sectiontitle">Syntax</h4><ul id="EN-US_TOPIC_0000001233430175__ul15566184614483"><li id="EN-US_TOPIC_0000001233430175__li1156617465480">Modify the expression used for a redaction policy to take effect.<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__s5d9fde3fca18406caf398a9d37601b16"><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">ALTER</span><span class="w"> </span><span class="n">REDACTION</span><span class="w"> </span><span class="n">POLICY</span><span class="w"> </span><span class="n">policy_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="k">WHEN</span><span class="w"> </span><span class="p">(</span><span class="n">new_when_expression</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
</li></ul>
</div>
<ul id="EN-US_TOPIC_0000001233430175__ul1116710119492"><li id="EN-US_TOPIC_0000001233430175__li581617145014">Enable or disable a redaction policy.<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen1126317351508"><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">ALTER</span><span class="w"> </span><span class="n">REDACTION</span><span class="w"> </span><span class="n">POLICY</span><span class="w"> </span><span class="n">policy_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="n">ENABLE</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">DISABLE</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
</li><li id="EN-US_TOPIC_0000001233430175__li2627137135016">Rename a redaction policy.<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen1517125135115"><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">ALTER</span><span class="w"> </span><span class="n">REDACTION</span><span class="w"> </span><span class="n">POLICY</span><span class="w"> </span><span class="n">policy_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="k">RENAME</span><span class="w"> </span><span class="k">TO</span><span class="w"> </span><span class="n">new_policy_name</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
</li><li id="EN-US_TOPIC_0000001233430175__li916771113492">Add, modify, or delete a column on which the redaction policy is used.<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen153101011155014"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">ALTER</span><span class="w"> </span><span class="n">REDACTION</span><span class="w"> </span><span class="n">POLICY</span><span class="w"> </span><span class="n">policy_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="w"> </span><span class="n">action</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001233430175__p9561113154812">There are several clauses of <strong id="EN-US_TOPIC_0000001233430175__b84235270611209">action</strong>:</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen159517518497"><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></pre></div></td><td class="code"><div><pre><span></span><span class="k">ADD</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="k">column_name</span><span class="w"> </span><span class="k">WITH</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="n">arguments</span><span class="w"> </span><span class="p">)</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="k">MODIFY</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="k">column_name</span><span class="w"> </span><span class="k">WITH</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="n">arguments</span><span class="w"> </span><span class="p">)</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="k">DROP</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="k">column_name</span>
</pre></div></td></tr></table></div>
</div>
</li></ul>
<div class="section" id="EN-US_TOPIC_0000001233430175__section328515545337"><h4 class="sectiontitle">Parameter Description</h4><ul id="EN-US_TOPIC_0000001233430175__ul10595352457"><li id="EN-US_TOPIC_0000001233430175__lfde7b0ce8c3c4a5db0f3b2fc758835d7"><strong id="EN-US_TOPIC_0000001233430175__b184593198556">policy_name</strong><p id="EN-US_TOPIC_0000001233430175__p119651650115511">Specifies the name of the redaction policy to be modified.</p>
</li><li id="EN-US_TOPIC_0000001233430175__li79943210555"><strong id="EN-US_TOPIC_0000001233430175__b19519104395516">table_name</strong><p id="EN-US_TOPIC_0000001233430175__p198284885610">Specifies the name of the table to which the redaction policy is applied.</p>
</li><li id="EN-US_TOPIC_0000001233430175__li4869182475513"><strong id="EN-US_TOPIC_0000001233430175__b1454154611557">new_when_expression</strong><p id="EN-US_TOPIC_0000001233430175__p1437514117585">Specifies the new expression used for the redaction policy to take effect.</p>
</li><li id="EN-US_TOPIC_0000001233430175__li1481192311562"><strong id="EN-US_TOPIC_0000001233430175__b8744152545811">ENABLE | DISABLE</strong><p id="EN-US_TOPIC_0000001233430175__p8759253195816">Specifies whether to enable or disable the current redaction policy.</p>
<ul id="EN-US_TOPIC_0000001233430175__ul1234983712013"><li id="EN-US_TOPIC_0000001233430175__li128819351403">ENABLE<p id="EN-US_TOPIC_0000001233430175__p175297472006"><a name="EN-US_TOPIC_0000001233430175__li128819351403"></a><a name="li128819351403"></a>Enables the redaction policy that was previously disabled for the table.</p>
</li><li id="EN-US_TOPIC_0000001233430175__li1384013401205">DISABLE<p id="EN-US_TOPIC_0000001233430175__p124801344113"><a name="EN-US_TOPIC_0000001233430175__li1384013401205"></a><a name="li1384013401205"></a>Disables the redaction policy currently applied to the table.</p>
</li></ul>
</li><li id="EN-US_TOPIC_0000001233430175__li1876233412565"><strong id="EN-US_TOPIC_0000001233430175__b5682128155818">new_policy_name</strong><p id="EN-US_TOPIC_0000001233430175__p13360153512112">Specifies the new name of the redaction policy.</p>
</li><li id="EN-US_TOPIC_0000001233430175__li3325154215616"><strong id="EN-US_TOPIC_0000001233430175__b244213015814">column_name</strong><p id="EN-US_TOPIC_0000001233430175__p121701225332">Specifies the name of the table column to which the redaction policy is applied.</p>
<p id="EN-US_TOPIC_0000001233430175__p877813271522">To add a column, use a column name that has not been bound to any redaction functions.</p>
<p id="EN-US_TOPIC_0000001233430175__p75438498320">To modify a column, use the name of an existing column.</p>
<p id="EN-US_TOPIC_0000001233430175__p91101551644">To delete a column, use the name of an existing column.</p>
</li><li id="EN-US_TOPIC_0000001233430175__li390665017567"><strong id="EN-US_TOPIC_0000001233430175__b18518123515813">function_name</strong><p id="EN-US_TOPIC_0000001233430175__p144512411251">Specifies the name of a redaction function.</p>
</li><li id="EN-US_TOPIC_0000001233430175__li85969520517"><strong id="EN-US_TOPIC_0000001233430175__b13590193705818">arguments</strong><p id="EN-US_TOPIC_0000001233430175__p45961452055">Specifies the list of arguments of the redaction function.</p>
<ul id="EN-US_TOPIC_0000001233430175__ul57861518193"><li id="EN-US_TOPIC_0000001233430175__li10746003193">MASK_NONE: indicates that no masking is performed.</li><li id="EN-US_TOPIC_0000001233430175__li63414143194">MASK_FULL: indicates that all data is masked to a fixed value.</li><li id="EN-US_TOPIC_0000001233430175__li139391716101914">MASK_PARTIAL: indicates that partial masking is performed based on the specified character type, numeric type, or time type.</li></ul>
</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0000001233430175__section1614144915295"><h4 class="sectiontitle">Examples</h4><div class="p" id="EN-US_TOPIC_0000001233430175__p10274171354514">Create a user named <strong id="EN-US_TOPIC_0000001233430175__b3175163781617">test_role</strong> and an example table named <strong id="EN-US_TOPIC_0000001233430175__b11623185531619">emp</strong>, and insert data into the table.<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen94793512371"><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">ROLE</span><span class="w"> </span><span class="n">test_role</span><span class="w"> </span><span class="n">PASSWORD</span><span class="w"> </span><span class="s1">'{Password}'</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen51941058182017"><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></pre></div></td><td class="code"><div><pre><span></span><span class="k">DROP</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">EXISTS</span><span class="w"> </span><span class="n">emp</span><span class="p">;</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">emp</span><span class="p">(</span><span class="n">id</span><span class="w"> </span><span class="nb">int</span><span class="p">,</span><span class="w"> </span><span class="n">name</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="w"> </span><span class="n">salary</span><span class="w"> </span><span class="nb">NUMERIC</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span><span class="mi">2</span><span class="p">));</span>
<span class="k">INSERT</span><span class="w"> </span><span class="k">INTO</span><span class="w"> </span><span class="n">emp</span><span class="w"> </span><span class="k">VALUES</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="s1">'July'</span><span class="p">,</span><span class="w"> </span><span class="mi">1230</span><span class="p">.</span><span class="mi">10</span><span class="p">),</span><span class="w"> </span><span class="p">(</span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="s1">'David'</span><span class="p">,</span><span class="w"> </span><span class="mi">999</span><span class="p">.</span><span class="mi">99</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<div class="p" id="EN-US_TOPIC_0000001233430175__p729677155217">Define a masking policy <strong id="EN-US_TOPIC_0000001233430175__b2026015915188">mask_emp</strong> on the <strong id="EN-US_TOPIC_0000001233430175__b1311772161915">emp</strong> table that hides the <strong id="EN-US_TOPIC_0000001233430175__b1395511921915">salary</strong> column from the <strong id="EN-US_TOPIC_0000001233430175__b4451121411199">user test</strong>_role.<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen1768511452117"><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="n">REDACTION</span><span class="w"> </span><span class="n">POLICY</span><span class="w"> </span><span class="n">mask_emp</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">emp</span><span class="w"> </span><span class="k">WHEN</span><span class="p">(</span><span class="k">current_user</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s1">'test_role'</span><span class="p">)</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="n">salary</span><span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="n">mask_full</span><span class="p">(</span><span class="n">salary</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
</div>
<p id="EN-US_TOPIC_0000001233430175__p9445113618162">Modify the expression for a redaction policy to make it take effect for the specified role (If no user is specified, the redaction policy takes effect for the current user by default.):</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen2724446286"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">ALTER</span><span class="w"> </span><span class="n">REDACTION</span><span class="w"> </span><span class="n">POLICY</span><span class="w"> </span><span class="n">mask_emp</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">emp</span><span class="w"> </span><span class="k">WHEN</span><span class="w"> </span><span class="p">(</span><span class="n">pg_has_role</span><span class="p">(</span><span class="k">current_user</span><span class="p">,</span><span class="w"> </span><span class="s1">'redact_role'</span><span class="p">,</span><span class="w"> </span><span class="s1">'member'</span><span class="p">));</span>
<span class="k">ALTER</span><span class="w"> </span><span class="n">REDACTION</span><span class="w"> </span><span class="n">POLICY</span><span class="w"> </span><span class="n">mask_emp</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">emp</span><span class="w"> </span><span class="k">WHEN</span><span class="w"> </span><span class="p">(</span><span class="n">pg_has_role</span><span class="p">(</span><span class="s1">'redact_role'</span><span class="p">,</span><span class="w"> </span><span class="s1">'member'</span><span class="p">));</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001233430175__p0561958161218">Modify the expression for the data redaction policy to make it take effect for all users.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen1392715017156"><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">ALTER</span><span class="w"> </span><span class="n">REDACTION</span><span class="w"> </span><span class="n">POLICY</span><span class="w"> </span><span class="n">mask_emp</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">emp</span><span class="w"> </span><span class="k">WHEN</span><span class="w"> </span><span class="p">(</span><span class="mi">1</span><span class="o">=</span><span class="mi">1</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001233430175__p15560155811215">Disable the redaction policy.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen278962710152"><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">ALTER</span><span class="w"> </span><span class="n">REDACTION</span><span class="w"> </span><span class="n">POLICY</span><span class="w"> </span><span class="n">mask_emp</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">emp</span><span class="w"> </span><span class="n">DISABLE</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001233430175__p115601458151219">Enable the redaction policy again.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen156316610151"><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">ALTER</span><span class="w"> </span><span class="n">REDACTION</span><span class="w"> </span><span class="n">POLICY</span><span class="w"> </span><span class="n">mask_emp</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">emp</span><span class="w"> </span><span class="n">ENABLE</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001233430175__p85591058121215">Change the redaction policy name to <strong id="EN-US_TOPIC_0000001233430175__b100155480033514">mask_emp_new</strong>.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen16274115813140"><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">ALTER</span><span class="w"> </span><span class="n">REDACTION</span><span class="w"> </span><span class="n">POLICY</span><span class="w"> </span><span class="n">mask_emp</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">emp</span><span class="w"> </span><span class="k">RENAME</span><span class="w"> </span><span class="k">TO</span><span class="w"> </span><span class="n">mask_emp_new</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001233430175__p8559125811211">Add a column with the redaction policy used.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen1256614981410"><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">ALTER</span><span class="w"> </span><span class="n">REDACTION</span><span class="w"> </span><span class="n">POLICY</span><span class="w"> </span><span class="n">mask_emp_new</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">emp</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="n">name</span><span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="n">mask_partial</span><span class="p">(</span><span class="n">name</span><span class="p">,</span><span class="w"> </span><span class="s1">'*'</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="k">length</span><span class="p">(</span><span class="n">name</span><span class="p">));</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001233430175__p255916587127">Modify the redaction policy for the <strong id="EN-US_TOPIC_0000001233430175__b72442500033514">name</strong> column. Use the <strong id="EN-US_TOPIC_0000001233430175__b10503275833514">MASK_FULL</strong> function to redact all data in the <strong id="EN-US_TOPIC_0000001233430175__b115045566633514">name</strong> column.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen38451327161415"><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">ALTER</span><span class="w"> </span><span class="n">REDACTION</span><span class="w"> </span><span class="n">POLICY</span><span class="w"> </span><span class="n">mask_emp_new</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">emp</span><span class="w"> </span><span class="k">MODIFY</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="n">name</span><span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="n">mask_full</span><span class="p">(</span><span class="n">name</span><span class="p">);</span>
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<p id="EN-US_TOPIC_0000001233430175__p11557558111216">Delete an existing column where the redaction policy is used.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233430175__screen3942620171418"><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">ALTER</span><span class="w"> </span><span class="n">REDACTION</span><span class="w"> </span><span class="n">POLICY</span><span class="w"> </span><span class="n">mask_emp_new</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">emp</span><span class="w"> </span><span class="k">DROP</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="n">name</span><span class="p">;</span>
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<div class="section" id="EN-US_TOPIC_0000001233430175__section1426016489355"><h4 class="sectiontitle">Helpful Links</h4><p id="EN-US_TOPIC_0000001233430175__p9325125517354"><a href="dws_06_0168.html">CREATE REDACTION POLICY</a>, <a href="dws_06_0199.html">DROP REDACTION POLICY</a></p>
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<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_06_0118.html">DDL Syntax</a></div>
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