I am working on jhipster spring using angular js and database as "liquibase".Why We need to delete whole database when we have done change in our db-changelog.xml?.if i have add one field to old table in database then i have a get exception t\_user table is already exist.which mean we have to remove t\_user table or loss our data.please help and provide any other way to change our database without deleting whole database.

Thanks in advance