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Improve documentation for \crosstabview.
Fix misleading syntax summary (there cannot be a space between colH and scolH). Provide a link from the existing crosstab() function's documentation to \crosstabview. Copy-edit the command's description. Christoph Berg and Tom Lane
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‎doc/src/sgml/ref/psql-ref.sgml

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Original file line numberDiff line numberDiff line change
@@ -989,106 +989,78 @@ testdb=>
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</listitem>
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</varlistentry>
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<varlistentry>
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<varlistentry id="APP-PSQL-meta-commands-crosstabview">
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<term><literal>\crosstabview [
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<replaceable class="parameter">colV</replaceable>
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<replaceable class="parameter">colH</replaceable>
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[:<replaceable class="parameter">scolH</replaceable>]
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<replaceable class="parameter">colH</replaceable>[:<replaceable class="parameter">scolH</replaceable>]
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[<replaceable class="parameter">colD</replaceable>]
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] </literal></term>
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<listitem>
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<para>
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Execute the current query buffer (like <literal>\g</literal>) and shows
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the results inside a crosstab grid.
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Executes the current query buffer (like <literal>\g</literal>) and
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shows the results in a crosstab grid.
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The query must return at least three columns.
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The output column <replaceable class="parameter">colV</replaceable>
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becomes a vertical header
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and the output column <replaceable class="parameter">colH</replaceable>
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The output column identified by <replaceable class="parameter">colV</>
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becomes a vertical header and the output column identified by
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<replaceable class="parameter">colH</replaceable>
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becomes a horizontal header, optionally sorted by ranking data obtained
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from <replaceable class="parameter">scolH</replaceable>.
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<replaceable class="parameter">colD</replaceable>
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is the output column to project into the grid. If this is not
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from column <replaceable class="parameter">scolH</replaceable>.
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<replaceable class="parameter">colD</replaceable> identifies
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the output column to display within the grid.
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If <replaceable class="parameter">colD</replaceable> is not
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specified and there are exactly three columns in the result set,
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the column that isn't
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the column that is neither
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<replaceable class="parameter">colV</replaceable> nor
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<replaceable class="parameter">colH</replaceable>
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is displayed; if there are more columns, an error is thrown.
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is displayed; if there are more columns, an error is reported.
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</para>
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<para>
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All columns can be refered to by their position (starting at 1), or by
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their name. Normal case folding and quoting rules apply on column
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names. By default,
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<replaceable class="parameter">colV</replaceable> corresponds to column 1
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and <replaceable class="parameter">colH</replaceable> to column 2.
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A query having only one output column cannot be viewed in crosstab, and
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Each column specification can be a column number (starting at 1) or
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a column name. The usual SQL case folding and quoting rules apply to
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column names. If omitted,
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<replaceable class="parameter">colV</replaceable> is taken as column 1
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and <replaceable class="parameter">colH</replaceable> as column 2.
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<replaceable class="parameter">colH</replaceable> must differ from
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<replaceable class="parameter">colV</replaceable>.
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</para>
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<para>
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The vertical header, displayed as the leftmost column,
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contains the deduplicated values found in
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column <replaceable class="parameter">colV</replaceable>, in the same
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order as in the query results.
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The vertical header, displayed as the leftmost column, contains the
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values found in column <replaceable class="parameter">colV</>, in the
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same order as in the query results, but with duplicates removed.
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</para>
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<para>
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The horizontal header, displayed as the first row,
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contains the deduplicated values found in
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column <replaceable class="parameter">colH</replaceable>, in
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the order of appearance in the query results.
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If specified, the optional <replaceable class="parameter">scolH</replaceable>
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argument refers to a column whose values should be integer numbers
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by which <replaceable class="parameter">colH</replaceable> will be sorted
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to be positioned in the horizontal header.
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The horizontal header, displayed as the first row, contains the values
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found in column <replaceable class="parameter">colH</replaceable>,
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with duplicates removed. By default, these appear in the same order
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as in the query results. But if the
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optional <replaceable class="parameter">scolH</> argument is given, it
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identifies a column whose values must be integer numbers, and the
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values from <replaceable class="parameter">colH</replaceable> will
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appear in the horizontal header sorted according to the
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corresponding <replaceable class="parameter">scolH</> values.
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</para>
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<para>
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Inside the crosstab grid,
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given a query output with <literal>N</literal> columns
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(including <replaceable class="parameter">colV</replaceable> and
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<replaceable class="parameter">colH</replaceable>),
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for each distinct value <literal>x</literal> of
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<replaceable class="parameter">colH</replaceable>
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and each distinct value <literal>y</literal> of
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<replaceable class="parameter">colV</replaceable>,
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the contents of a cell located at the intersection
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<literal>(x,y)</literal> is determined by these rules:
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<itemizedlist>
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<listitem>
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<para>
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if there is no corresponding row in the query results such that the
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value for <replaceable class="parameter">colH</replaceable>
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is <literal>x</literal> and the value
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for <replaceable class="parameter">colV</replaceable>
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is <literal>y</literal>, the cell is empty.
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</para>
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</listitem>
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<listitem>
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<para>
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if there is exactly one row such that the value
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for <replaceable class="parameter">colH</replaceable>
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is <literal>x</literal> and the value
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for <replaceable class="parameter">colV</replaceable>
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is <literal>y</literal>, then the <literal>colD</literal> column
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is displayed.
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Inside the crosstab grid, for each distinct value <literal>x</literal>
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of <replaceable class="parameter">colH</replaceable> and each distinct
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value <literal>y</literal>
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of <replaceable class="parameter">colV</replaceable>, the cell located
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at the intersection <literal>(x,y)</literal> contains the value of
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the <literal>colD</literal> column in the query result row for which
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the value of <replaceable class="parameter">colH</replaceable>
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is <literal>x</literal> and the value
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of <replaceable class="parameter">colV</replaceable>
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is <literal>y</>. If there is no such row, the cell is empty. If
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there are multiple such rows, an error is reported.
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</para>
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</listitem>
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<listitem>
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<para>
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if there are several such rows, an error is thrown.
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</para>
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</listitem>
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</itemizedlist>
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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><literal>\d[S+] [ <link linkend="APP-PSQL-patterns"><replaceable class="parameter">pattern</replaceable></link> ]</literal></term>
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‎doc/src/sgml/tablefunc.sgml

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@@ -293,6 +293,14 @@ AS ct(row_name text, category_1 text, category_2 text, category_3 text);
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required <literal>FROM</> clause in a view definition.
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</para>
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<note>
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<para>
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See also the <command><link linkend="APP-PSQL-meta-commands-crosstabview">\crosstabview</link></command>
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command in <application>psql</>, which provides functionality similar
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to <function>crosstab()</>.
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</para>
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</note>
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</sect3>
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<sect3>

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