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OPENJPA-478: Get rid of contradictory text about HAVING without GROUP BY in user guide. 

git-svn-id: https://svn.apache.org/repos/asf/openjpa/trunk@1083258 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Milosz Tylenda 2011-03-19 19:36:05 +00:00
parent 0971bd301c
commit 0b72fb417a
1 changed files with 11 additions and 3 deletions
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14
openjpa-project/src/doc/manual/jpa_overview_query.xml
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@ -3627,10 +3627,18 @@ that apply to grouping items.
<para>
If there is no <literal>GROUP BY</literal> clause and the <literal>HAVING
</literal> clause is used, the result is treated as a single group, and the
select list can only consist of aggregate functions. When a query declares a
<literal>HAVING</literal> clause, it must always also declare a <literal>GROUP
BY</literal> clause.
select list can only consist of aggregate functions.
The use of <literal>HAVING</literal> in the absence of
<literal>GROUP BY</literal> is not required to be supported by a JPA implementation.
Portable applications should not rely on <literal>HAVING</literal> without the use of
<literal>GROUP BY</literal>.
</para>
<note>
<para>
OpenJPA supports the use of <literal>HAVING</literal> in the absence of
<literal>GROUP BY</literal> if the underlying database supports it.
</para>
</note>
<para>
Examples:
</para>