mklinkj ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *commented* on HHH-16448 ( https://hibernate.atlassian.net/browse/HHH-16448?atlOrigin=eyJpIjoiOTQ0OT... ) Re: After upgrading to Hibernate 6.2.0.Final, the unique attribute of `@JoinColumn` always behaves as true. ( https://hibernate.atlassian.net/browse/HHH-16448?atlOrigin=eyJpIjoiOTQ0OT... ) Thank you for answer. I made a mistake. Despite using @OneToOne , the initial data was incorrectly entered as data in which Strudent has multiple MembershipCards. The table auto-creation statement created by 6.2.0 is correct. Next time I report, I'll check more and post it. 😅 thank you. ( https://hibernate.atlassian.net/browse/HHH-16448#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16448#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100221- sha1:9ff53d8 )