Views

BI Views are logical representations of data obtained from underlying queries. Where queries represent particular facts within a data source, views represent answers to particular questions. For example, you may have a query definition for "Patients", however a view for "Patients By Gender By Age". 
Views allow you to:
1.Aggregate data from queries using a common database independent syntax 
2.Pivot data from queries using defined buckets / columns
3.Further filter queries based on a sub-set of data
View Definition Files
View definition files are defined using the BiViewDeifnition root.
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<?xml version="1.0"?>
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<BiViewDefinition xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="by-type-date" id="org.santedb.bi.core.view.session.type" xmlns="http://santedb.org/bi">
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  <meta status="active">
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    <authors>
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      <add>SanteSuite Contributors</add>
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    </authors>
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  </meta>
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  <query ref="#org.santedb.bi.core.query.session" />
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  <aggregations>
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    <add>
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      <providers>
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        <invariant>psql</invariant>
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      </providers>
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      <grouping>
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        <column name="crt_utc">cast(crt_utc as DATE)</column>
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        <column name="ses_typ">ses_typ</column>
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      </grouping>
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      <select>
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        <column name="ses_typ" fn="value">ses_typ</column>
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        <column name="ses_date" fn="value">cast(crt_utc as DATE)</column>
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        <column name="n_sessions" fn="count-distinct">ses_id</column>
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      </select>
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    </add>
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  </aggregations>
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  <pivot key="ses_date" columnDef="ses_typ" value="n_sessions" fn="sum" />
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</BiViewDefinition>
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View Definition Files