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Crosstab reports contains tables that arrange data across rows and columns in a tabular form. Crosstabs can be used with any level of data (nominal, ordinal, interval, or ratio).
Data Grouping in Jaspersoft Crosstab:
The crosstab calculation engine aggregates data by iterating through the associated dataset records. In order to aggregate data, one needs to group them first. In a crosstab, rows and columns are based on specific group items, called buckets. A bucket definition should contain:
•bucketExpression − The expression to be evaluated in order to obtain data group items.
•comparatorExpression–The expression is to use for ordering the values. If no expression is present, the default ordering for the data type is used
•orderByExpression− Indicates the value used to sort data.
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