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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