Source : Free On-Line Dictionary of Computing

POSTQUEL
     
        POSTGRES QUERy Language.  The language used by the {POSTGRES}
        {database} system.
     
        ["The Design of POSTGRES", M. Stonebraker et al, Proc ACM
        SIGMOD Conf, June 1986].
     
        {Version 4.0
        (ftp://postgres.berkeley.edu/pub/postgresv4r0.tar.Z)}.