Realiza una agrupación del contenido de la tabla virtual en base a las columnas indicadas.

1 vtable.group

<vtable.group columns='columns'>
    <vtable /> ?
</vtable.group>
Example

Agrupar una tabla virtual por columnas.

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<xsql-script name='vtable_group'>
    <body>
        <vtable name='v1'>
            <column name='region' type='char' />
            <column name='product' type='char' />
            <column name='sales' type='decimal' />
        </vtable>

        <vtable.insert name='v1'>
            <matrix>
                {"USA ","NIKE ", "12"}
                {"USA ","PUMA ", "20"}
                {"USA ","PUMA ", "50"}
                {"USA ","REEBOK ", "15"}
                {"EUROPE","NIKE ", "12"}
                {"EUROPE","PUMA ", "15"}
                {"EUROPE","REEBOK ", "22"}
            </matrix>
        </vtable.insert>
   
        <println><v1/></println>
        <println>
                <vtable.group columns='region'>
                    <v1 />
                </vtable.group>
        </println>

    </body>
</xsql-script>

Nos muestra el siguiente resultado.

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+------+
|region|
|char  |
+------+
|USA   |
|EUROPE|
+------+