How to create and use expressions in Jaspersoft Studio

This tutorial demonstrates how to use the Expression Editor in Jaspersoft Studio to create custom expressions. Expressions consist of generic functions and other elements that you can use to define various settings in your report or visualization. A few examples of what you can do with expressions include:
• Show or hide an element
• Perform special calculations
• Invoke custom functions

[AT-yvcy]

How do I write an expression if I want to replace multiple results? Just like how you replaced null with N/D?

[pramoddharshana]

How to add sql aggrigate functions it's does not work on me in sql aggrigate functions...

[jlbuenomeandro]

How can I write an expression (a condition) when a field changes of value and to provoke a control brake (subtotal)?

[siyabongabushula]

Hi I have a Jasper report with a sub report now I want the report to display the data only if there's data on the sub-report hence the details are from the sub-report only headers from the main
I created a variable which is a 1 or 0, when this variable is 1 it means there's a data to display so I set the print when to " $V{Variable_1}.equals(1) " and it comes with a blank report I would appreciate if someone could help.

[vranjit]

how to reduce vertical spacing between rows in Jasper studio in Detail Band.

[alfredomant]

I dont't know how to sum text field with expressions :(

[savithak]

Hi! Can u pls help me how to add parameter with drop down in jasper studio?