Hello everyone, I have a question again. In the employee table, the key is the employee's service number and, among others, there is a row with the number of the EM card. In the task form, the line is a reference to an employee, I need the employee I...

There is a configuration table in which there are things of three main types - material, component, product. The product may contain materials and components of varying degrees of nesting, components - other components and materials. I cannot make a ...