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Annotation of 42BSD/ingres/doc/quel/retrieve.nr, revision 1.1

1.1     ! root        1: .th RETRIEVE QUEL 2/29/79
        !             2: .sh NAME
        !             3: retrieve \- retrieve tuples from a relation
        !             4: .sh SYNOPSIS
        !             5: .bd retrieve 
        !             6: [[\c
        !             7: .bd into\c
        !             8: ] relname] (target_list) 
        !             9: [\c
        !            10: .bd where 
        !            11: qual]
        !            12: .br 
        !            13: .bd "retrieve unique" 
        !            14: (target_list) [\c
        !            15: .bd where
        !            16: qual]
        !            17: .sh DESCRIPTION
        !            18: .it Retrieve 
        !            19: will get all tuples which satisfy the qualification and
        !            20: either display them on the terminal
        !            21: (standard output) or store them in a new relation.
        !            22: 
        !            23: If a relname is specified, the result of the query will be stored in a new
        !            24: relation with the indicated name.
        !            25: A relation with this name
        !            26: owned by the user must not already exist.
        !            27: The current user will be the owner of the new relation.
        !            28: The relation will have domain names as specified in the 
        !            29: .it target_list
        !            30: result_attnames.
        !            31: The new relation will be saved on the system for seven days unless
        !            32: explicitly saved by the user until a later date.
        !            33: .s1
        !            34: If the keyword
        !            35: .bd unique
        !            36: is present, tuples will be sorted on the
        !            37: first domain, and duplicates will be removed, before being
        !            38: displayed.
        !            39: .s1
        !            40: The keyword 
        !            41: .bd all
        !            42: can be used when it is desired to
        !            43: retrieve all domains.
        !            44: 
        !            45: If no result 
        !            46: .it relname 
        !            47: is specified then the result of the query will be
        !            48: displayed on the terminal and will not be saved.
        !            49: Duplicate tuples are not removed when the result is
        !            50: displayed on the terminal.
        !            51: 
        !            52: The format in which domains are printed can be
        !            53: defined at the time ingres is invoked (see ingres(unix)).
        !            54: 
        !            55: If a result relation is specified then
        !            56: the default procedure is
        !            57: to modify the result relation to an cheapsort storage structure
        !            58: removing duplicate tuples in the process.
        !            59: 
        !            60: If the default cheapsort structure is not desired, the
        !            61: user can override this at the time \*(II is
        !            62: invoked by using the 
        !            63: .bd \-r
        !            64: switch (see ingres(unix)).
        !            65: .s3
        !            66: Only the relation's owner and users with retrieve permission may 
        !            67: .it retrieve 
        !            68: from it.
        !            69: .sh EXAMPLE
        !            70: .nf
        !            71: /\*(** Find all employees who make more than their manager \*(**/
        !            72:    range of e is emp
        !            73:    range of m is emp
        !            74:    retrieve (e.name) where e.mgr = m.name
        !            75:            and e.sal > m.sal
        !            76: /\*(** Retrieve all domains for those who make more
        !            77:        than the average salary \*(**/
        !            78:    retrieve into temp (e.all) where e.sal > avg(e.sal)
        !            79: /\*(** retrieve employees's names sorted \*(**/
        !            80:    retrieve unique (e.name)
        !            81: .fi
        !            82: .sh "SEE ALSO"
        !            83: modify(quel), permit(quel), quel(quel), range(quel), 
        !            84: save(quel), ingres(unix)
        !            85: .sh DIAGNOSTICS
        !            86: .sh BUGS

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