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doc: Fix markup and improve placeholder names
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@ -29,7 +29,7 @@ INSERT INTO <replaceable class="PARAMETER">table_name</replaceable> [ AS <replac
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<phrase>where <replaceable class="parameter">conflict_target</replaceable> can be one of:</phrase>
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( { <replaceable class="parameter">column_name_index</replaceable> | ( <replaceable class="parameter">expression_index</replaceable> ) } [ COLLATE <replaceable class="parameter">collation</replaceable> ] [ <replaceable class="parameter">opclass</replaceable> ] [, ...] ) [ WHERE <replaceable class="PARAMETER">index_predicate</replaceable> ]
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( { <replaceable class="parameter">index_column_name</replaceable> | ( <replaceable class="parameter">index_expression</replaceable> ) } [ COLLATE <replaceable class="parameter">collation</replaceable> ] [ <replaceable class="parameter">opclass</replaceable> ] [, ...] ) [ WHERE <replaceable class="PARAMETER">index_predicate</replaceable> ]
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ON CONSTRAINT <replaceable class="PARAMETER">constraint_name</replaceable>
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<phrase>and <replaceable class="parameter">conflict_action</replaceable> is one of:</phrase>
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@ -293,8 +293,8 @@ INSERT INTO <replaceable class="PARAMETER">table_name</replaceable> [ AS <replac
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<parameter>conflict_target</parameter> can perform
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<emphasis>unique index inference</emphasis>. When performing
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inference, it consists of one or more <replaceable
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class="PARAMETER">column_name_index</replaceable> columns and/or
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<replaceable class="PARAMETER">expression_index</replaceable>
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class="PARAMETER">index_column_name</replaceable> columns and/or
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<replaceable class="PARAMETER">index_expression</replaceable>
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expressions, and an optional <replaceable class="PARAMETER">
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index_predicate</replaceable>. All <replaceable
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class="PARAMETER">table_name</replaceable> unique indexes that,
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@ -321,7 +321,7 @@ INSERT INTO <replaceable class="PARAMETER">table_name</replaceable> [ AS <replac
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<variablelist>
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<varlistentry>
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<term><literal>conflict_target</literal></term>
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<term><replaceable class="parameter">conflict_target</replaceable></term>
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<listitem>
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<para>
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Specifies which conflicts <literal>ON CONFLICT</literal> takes
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@ -339,7 +339,7 @@ INSERT INTO <replaceable class="PARAMETER">table_name</replaceable> [ AS <replac
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</varlistentry>
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<varlistentry>
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<term><literal>conflict_action</literal></term>
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<term><replaceable class="parameter">conflict_action</replaceable></term>
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<listitem>
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<para>
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<parameter>conflict_action</parameter> specifies an
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@ -366,31 +366,31 @@ INSERT INTO <replaceable class="PARAMETER">table_name</replaceable> [ AS <replac
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</varlistentry>
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<varlistentry>
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<term><replaceable class="PARAMETER">column_name_index</replaceable></term>
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<term><replaceable class="PARAMETER">index_column_name</replaceable></term>
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<listitem>
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<para>
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The name of a <replaceable
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class="PARAMETER">table_name</replaceable> column. Used to
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infer arbiter indexes. Follows <command>CREATE
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INDEX</command> format. <literal>SELECT</> privilege on
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<replaceable class="PARAMETER">column_name_index</replaceable>
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<replaceable class="PARAMETER">index_column_name</replaceable>
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is required.
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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">expression_index</replaceable></term>
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<term><replaceable class="PARAMETER">index_expression</replaceable></term>
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<listitem>
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<para>
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Similar to <replaceable
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class="PARAMETER">column_name_index</replaceable>, but used to
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class="PARAMETER">index_column_name</replaceable>, but used to
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infer expressions on <replaceable
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class="PARAMETER">table_name</replaceable> columns appearing
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within index definitions (not simple columns). Follows
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<command>CREATE INDEX</command> format. <literal>SELECT</>
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privilege on any column appearing within <replaceable
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class="PARAMETER">expression_index</replaceable> is required.
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class="PARAMETER">index_expression</replaceable> is required.
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</para>
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</listitem>
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</varlistentry>
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@ -400,8 +400,8 @@ INSERT INTO <replaceable class="PARAMETER">table_name</replaceable> [ AS <replac
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<listitem>
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<para>
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When specified, mandates that corresponding <replaceable
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class="PARAMETER">column_name_index</replaceable> or
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<replaceable class="PARAMETER">expression_index</replaceable>
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class="PARAMETER">index_column_name</replaceable> or
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<replaceable class="PARAMETER">index_expression</replaceable>
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use a particular collation in order to be matched during
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inference. Typically this is omitted, as collations usually
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do not affect whether or not a constraint violation occurs.
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@ -415,8 +415,8 @@ INSERT INTO <replaceable class="PARAMETER">table_name</replaceable> [ AS <replac
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<listitem>
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<para>
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When specified, mandates that corresponding <replaceable
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class="PARAMETER">column_name_index</replaceable> or
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<replaceable class="PARAMETER">expression_index</replaceable>
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class="PARAMETER">index_column_name</replaceable> or
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<replaceable class="PARAMETER">index_expression</replaceable>
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use particular operator class in order to be matched during
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inference. Typically this is omitted, as the
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<emphasis>equality</emphasis> semantics are often equivalent
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