How to get max date in child table

I have tow tables Departments as the master table and Employees as the child table
The employees table (the child) has employee_hiring_date Field .
I want to get the maximum hiring date in the employee table for every department to make validation over it.
How to make this.

It's more or less described in the doc I gave you.
OK, lets do it with your sample.
I assume you have accessors defined to navigate between the master and the detail (in both directions). The accessors on entity level are named
"Employees1" to get the employees of a department
"Departments1" to get the department of an employee
1. In the Departments entity you add a transient attribute "MaxSalary" as type Number, select 'Expression' as 'Value Type' and type "Employees1.max("Salary")" in the value field. Make sure to uncheck the 'Persistent' attribute in the dialog. This will mark the attribute as transient.
2. in the entity Employees open the 'Business Rules' and select the 'Saraly' attribute. Add a rule by clicking the green plus. 'Rule Type' is 'Compare', 'Operator' is 'LessOrEqualTo' and in the 'Compare With' drop down select 'Expression'. In the Dialog enter "Departments1.MaxSalary". Switchto the 'FailureHandling' tab and type in a message you like to see (e.g. 'The Salary is too high!") and save your work. The magic is done in the expression "Departments1.MaxSalary" which selects the department of the employee and gets the value of the attribute 'MaxSalary' which is an other Groovy expression which gets the max salary of all employees in the department.
3. To get the 'MaxSalary' attribute from the entity to the view object, you can open the VO editor and select the 'Attributes' section. Click the arrow down right of green plus and select 'Add Attribute from Entity, shuffle the MaxSalary attribute you see in the Department entity to the right and save your work.
If you now test the app in the Tester try changing the salary of an employee to a value higher then max of the department and you should see your error message.
Timo

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