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Provide adequate documentation of the "table_name *" notation.

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Somewhere along the line, somebody decided to remove all trace of this
notation from the documentation text.  It was still in the command syntax
synopses, or at least some of them, but with no indication what it meant.
This will not do, as evidenced by the confusion apparent in bug #7543;
even if the notation is now unnecessary, people will find it in legacy
SQL code and need to know what it does.
This commit is contained in:
Tom Lane
2012-09-17 14:59:31 -04:00
parent b2e3bea3af
commit 3c64342c86
9 changed files with 104 additions and 73 deletions
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14
doc/src/sgml/ref/update.sgml
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@@ -22,7 +22,7 @@ PostgreSQL documentation
<refsynopsisdiv>
<synopsis>
[ WITH [ RECURSIVE ] <replaceable class="parameter">with_query</replaceable> [, ...] ]
UPDATE [ ONLY ] <replaceable class="PARAMETER">table_name</replaceable> [ [ AS ] <replaceable class="parameter">alias</replaceable> ]
UPDATE [ ONLY ] <replaceable class="PARAMETER">table_name</replaceable> [ * ] [ [ AS ] <replaceable class="parameter">alias</replaceable> ]
SET { <replaceable class="PARAMETER">column_name</replaceable> = { <replaceable class="PARAMETER">expression</replaceable> | DEFAULT } |
( <replaceable class="PARAMETER">column_name</replaceable> [, ...] ) = ( { <replaceable class="PARAMETER">expression</replaceable> | DEFAULT } [, ...] ) } [, ...]
[ FROM <replaceable class="PARAMETER">from_list</replaceable> ]
@@ -41,13 +41,6 @@ UPDATE [ ONLY ] <replaceable class="PARAMETER">table_name</replaceable> [ [ AS ]
columns not explicitly modified retain their previous values.
</para>
<para>
By default, <command>UPDATE</command> will update rows in the
specified table and all its subtables. If you wish to only update
the specific table mentioned, you must use the <literal>ONLY</>
clause.
</para>
<para>
There are two ways to modify a table using information contained in
other tables in the database: using sub-selects, or specifying
@@ -97,6 +90,11 @@ UPDATE [ ONLY ] <replaceable class="PARAMETER">table_name</replaceable> [ [ AS ]
<listitem>
<para>
The name (optionally schema-qualified) of the table to update.
If <literal>ONLY</> is specified before the table name, matching rows
are updated in the named table only. If <literal>ONLY</> is not
specified, matching rows are also updated in any tables inheriting from
the named table. Optionally, <literal>*</> can be specified after the
table name to explicitly indicate that descendant tables are included.
</para>
</listitem>
</varlistentry>