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How to construct an aggregate expression in Expression Builder

  1. In Expression Builder, under Category, select BIRT Functions.
  2. Sub-Category displays the classes of functions defined by BIRT.
  3. Select Total.
  4. Expression Builder displays the aggregate functions.
  5. Double-click the aggregate function you want to use.
  6. The function appears in the expression area of Expression Builder.
  7. Within the parenthesis, ( ), of the function, specify the data set field whose values you want to aggregate:
    1. Under Category, choose Available Data Sets.
    2. Under Sub-Category, choose the data set that contains the field.
    3. Double-click the field to insert it between the parenthesis, ( ), of the aggregate function.


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