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doc: Add missing description for DROP SUBSCRIPTION IF EXISTS.
Oversight in commit 665d1fad99.
Author: Peter Smith <smithpb2250@gmail.com>
Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Discussion: https://postgr.es/m/CAHut%2BPv72haFerrCdYdmF6hu6o2jKcGzkXehom%2BsP-JBBmOVDg%40mail.gmail.com
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@ -49,6 +49,16 @@ DROP SUBSCRIPTION [ IF EXISTS ] <replaceable class="parameter">name</replaceable
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><literal>IF EXISTS</literal></term>
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<listitem>
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<para>
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Do not throw an error if the subscription does not exist. A notice is
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issued in this case.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">name</replaceable></term>
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<listitem>
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