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MONDRIAN: Document defaultMember attribute of Hierarchy element.
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julianhyde committed Aug 7, 2006
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28 changes: 27 additions & 1 deletion doc/schema.html
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</head>
<body>
<h1>How to Design a Mondrian Schema</h1>
<p>By Julian Hyde and others; last updated May, 2006.</p>
<p>By Julian Hyde and others; last updated August, 2006.</p>
<hr color="#000000" noshade="noshade" size="1">
<h2>Contents</h2>
<ol>
Expand All @@ -37,6 +37,7 @@ <h2>Contents</h2>
<li><a href="#Mapping_Hierarchies">Mapping dimensions and
hierarchies onto tables</a></li>
<li><a href="#The_all_member">The 'All' member</a></li>
<li><a href="#Default_member">Default member</a></li>
<li><a href="#Time_dimensions">Time dimensions</a></li>
<li><a href="#Level_Order_and_Display">Order and Display of
Levels</a></li>
Expand Down Expand Up @@ -415,6 +416,31 @@ <h4><a name="The_all_member">The 'all' member</a></h4>
the hierarchy. Changing the default member can be confusing, so you
should generally use <code>
hasAll="true"</code>.</p>
<h4><a name="Default_member">Default member</a></h4>
<p>Every hierarchy has a default member. This is the member which is used in the
evaluation context if the hierarchy is not explicitly mentioned in a query. If
the hierarchy has an 'all' member, then this is the default; otherwise, the
default member is the first member of the first level. For example, in the
FoodMart schema, the default member of the <code>[Time]</code> dimension is
<code>[Time].[1997]</code>, because 1997 is the first year for which there is
data in the dimension table.</p>
<p>A different default member can be specified in the hierarchy definition:</p>
<blockquote>
<p><code>&lt;<a href="#XML_Dimension">Dimension</a> name=&quot;Status" foreignKey="issue_status"&gt;<br> &nbsp; &lt;<a
href="#XML_Hierarchy">Hierarchy</a> hasAll="true" primaryKey="id"&gt;<br> &nbsp;&nbsp;&nbsp; &lt;<a
href="#XML_Table">Table</a> name="status_codes" /&gt;<br> &nbsp;&nbsp;&nbsp; &lt;<a
href="#XML_Level">Level</a> name=&quot;Code" column=&quot;id" nameColumn=&quot;name&quot; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; uniqueMembers="true" defaultMember=&quot;[Status
code].[Open]&quot; /&gt;<br> &nbsp; &lt;/<a
href="#XML_Hierarchy">Hierarchy</a>&gt;<br>&lt;/<a
href="#XML_Dimension">Dimension</a>&gt;</code></p>
</blockquote>
<p>Real-world applications often have a requirement to report on the current
time period. Clearly, one way of doing this is to change the default member of
the time dimension. But a better way is use a <a href="#Schema_parameters">
schema parameter</a> for the current time period; then you can leave the default
time member as <code>[Time].[(All time)]</code> for those reports that want to
look at historical data.</p>
<h4><a name="Time_dimensions">Time dimensions</a></h4>
<p>Time dimensions based on year/month/week/day are coded differently
in the Mondrian schema due to the MDX time related functions such as:</p>
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74 changes: 37 additions & 37 deletions doc/stylesheet.css
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/* End stylesheet.css */

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