How to create unique constraint for 2 columns in JDL-Studio?

Question

I have following entity configuration:

entity AirplaneModelSeat { 
    id Long, 
    seatNo String required 
}
relationship ManyToOne   { 
    AirplaneModelSeat{         


        

Answer 1

In addition to Oerd's answer ^_^ In addition to the Liquibase configuration in David's answer I suggest you also add the relevant JPA annotations to your Entity.

If only To ensure a field value is unique you can write

@Column(unique=true)
String username;

The @UniqueConstraint annotation is for annotating multiple unique keys at the table level.

And also for Liquibase configuration, iff only To ensure a field value is unique you can write