Add Custom Aggregation

To add a custom aggregation, click Add expression and follow these steps:

  1. Output is the name of column that holds the results of aggregation; specify a name.

  2. Expression is the expression to add. To define an expression, click Launch expression Builder to edit Expression to launch Expression Builder.

    This expression calculates all products bout by a customer and casts the result to a nested data type:

    CAST (COLLECT (TO_CHAR (PROD_ID)) AS ODMR_NESTED_VARCHAR2)

  3. To define a Sub Group By column, click Edit to launch Edit Group By. (Sub-Group By is explained in Define Aggregation.) It is not necessary to define a Sub Group By column.

  4. Click Validate to validate the expression.

  5. When you are done, click OK.