[JPA] Error executing DDL "alter table post drop foreign key

  jpa:
    database-platform: org.hibernate.dialect.MySQL5InnoDBDialect
    open-in-view: false
    show-sql: true
    hibernate:
      format_sql: true
      ddl-auto: create   >> 기존에 있던 테이블을 버리고 새롭게 생성하는것. 
       
       
     

ddl-auto : create 를 update로 변경하면 문제해결