Hibernate generate value on non primary key with combination of field + max

Example i have this table table transaction * id int (PK) * unit varchar(10) * journal_number journal number is combination of unit and a sequence. so example data could be like this id | unit | journal_number ------------------------------ 1 | 'unit1' | 1 2 | 'unit1' | 2 3 | 'unit2' | 1 4 | 'unit2' | 2 ... i how to create the journal_number automatically ? is there any solution for this in hibernate without doing this manually ? like using a Generator If i have to do this manually, for example if there is a new row for the 'unit1'. then i have to to this select max(journal_number) where unit = 'unit1' then asign the result to the new row
You can use composite Key.If I got it

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