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Magnum One
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Magnum One (Mid-American Digital) (Disc Manufacturing).iso
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D501
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1990-06-16
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2KB
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150 lines
*501010
C13,0
x╨ÇΦ
rââΦ ╠─
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*501020
C15,0
räú° Session 5
Z1.0
rÅú° ∙ Queries
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*501030
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rëèÉIn this session you will:
ræì°∙
ròìÉDesign a view query for your database file
ræÅ°∙
ròÅÉSave the view query
rææ°∙
ròæÉView data resulting from the view query
rªÿ≡Press
r¡ÿ°──┘
r▒ÿ≡ to continue or
r├ÿ°F5
r┼ÿ≡ to exit
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QC1
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*501040
C7,0
rëè╕ Ö
ræì╕ «
ræÅ╕ ù
rææ╕ ½
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*501050
C2,0
rëêÉView queries allow you to filter the data in your file.
rëèÉSuppose you want a list of books published in 1986 and
rëîÉlater. The list should contain:
rùÄÉthe
r¢Ä≡year
rƒÄÉ of publication
rùÉÉthe
r¢É≡title
ráÉÉ of the book
rëôÉNone of the other information in the database is needed.
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*501060
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rëê╪ ┴
rëè╪ ╗
rëî╪ ║
rëÄ╪ ╖
rëÉ╪ ╕
rëô╕ ╕
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*501070
C2,0
rëçÉBefore printing such a list, you need to tell dBASE IV
rëëÉwhich pieces of information you require:
ræîÉYou need records only of books published
ræÄÉafter 1985.
rææÉYou need only two fields from each record,
ræôÉYear and Title.
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*501080
C11,0
rëç╪ ║
rëë╪ ⌐
ræî╪ ░
ræÄ╪ ¢
rææ╪ ½
ræô╪ Å
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*501090
C2,0
rëèÉTo retrieve only certain information from a file,
rëîÉyou create a
rûî≡view query
ráîÉ, which acts as a filter.
rëÄÉThe original data remains unchanged, and you see only
rëÉÉthe information you specify.
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*501100
C7,0
rëè╕ ╡
rëî╕ ╢
rëÄ╕ ╢
rëÉ╕ £
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*501102
C14,0
rëê≡Please note.
rëèÉDuring this session, you will use the F5 key several times
rëîÉto perform a dBASE IV operation. On those screens, F5 will
rëÄÉnot be available to exit the tutorial.
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*501104
C7,0
rëê╕ î
rëè╕ ║
rëî╕ ║
rëÄ╕ ª
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*501110
C2,0
rëèÉTo create a view query, you'll begin at the Control Center.
rëìÉPress
rÉì°──┘
röìÉ to continue.
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a8,P,,,,&H0D,,
a8,C,D002,,,&H003F,,
*501120
C13,0
rââΦ ╠
rëèΦ ╗
rëìΦ Ö
rªÿΦ ¬
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