java - Select first booking of each vehicle in JPQL -


i'm trying select first booking of each vehicle having difficulties. query have is

@namedquery(name = "findbookingbyvehicle", query = "select c.colour, c.seats, c.make, c.model, b.departuredate, b.returndate, b.bookingdate, e.fname, e.lname vehicle c join c.booking b join b.employee e c = b.vehicle , b.employee = e order b.bookingdate, b.departuredate ")

but selects of bookings of each vehicle.

my table structure is:

table picture

how go selecting first booking of each vehicle?

i ended using query had select of bookings vehicle , removed bookings of later date in ejb.


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