@UniqueConstraint and @Column(unique = true) in hibernate annotation

Question

What is difference between @UniqueConstraint and @Column(unique = true)?

For example:

@Table(
   name = \"product_s         


        

Answer 1

From the Java EE documentation:

public abstract boolean unique

(Optional) Whether the property is a unique key. This is a shortcut for the UniqueConstraint annotation at the table level and is useful for when the unique key constraint is only a single field. This constraint applies in addition to any constraint entailed by primary key mapping and to constraints specified at the table level.

See doc