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- *501010
- C14,3
- x╨Ç≤
- rââ√ ╠─
- q╧ÿ√N,,,,,,
- a7,P,,,,,,
- *501020
- C15,0
- räâ° Session 5
- rÅú° ∙ Queries
- q╧ÿ°P,2,,,,,
- a1,P,,,,,,
- *501030
- C14,3
- rëè≤In this session you will:
- ræì√∙
- ròì≤Design a view query for your database file
- ræÅ√∙
- ròÅ≤Save the view query
- rææ√∙
- ròæ≤View data resulting from the view query
- r¿û±
- r⌐ûßPress ─┘
- r▓û± to continue or
- r┬ûßF5
- r─û± to exit
- q╧ÿ≤S,,,,,,
- QC1
- a7,G,,,,,,
- a8,P,,,,&H0D,,
- a8,C,D002,,,&H003F,,
- *501050
- C14,1
- rïç±┌ ║─┐
- rïê±│ View queries allow you to filter the data in your file. │
- rïë±│ Suppose you want a list of books published in 1986 and │
- rëè≤
- rïè±│ later. The list should contain: Ü │
- rïï±│ ║ │
- rïî±│ ë the year of publication Ü │
- rïì±│ ë the title of the book £ │
- rïı│ ║ │
- rïű│ None of the other information in the database is needed. │
- rïɱ└ ║─┘
- rææ≤ ¼
- q╧ÿ≤S,,,,,,
- QC1
- a7,G,,,,,,
- a8,P,,,,&H0D,,
- a8,C,D002,,,&H003F,,
- *501070
- C14,1
- rìê±Before printing such a list, you need to tell dBASE IV
- rìë±which pieces of information you require: Ä
- rìè± í
- ròï±You need records only of books published
- ròî±after 1985. É
- ròì± ù
- ròıYou need only two fields from each record,
- rìű ê Year and Title. ó
- q╧ÿ╕S,,,,,,
- QC1
- a7,G,,,,,,
- a8,P,,,,&H0D,,
- a8,C,D002,,,&H003F,,
- *501090
- C14,1
- rìê±To retrieve only certain information from a file, å
- rìë±you create a view query. This acts as a filter.
- rìè±The original data remains unchanged, but you see only
- rìï±the information you specify. ò
- ròî± ï
- rìì±You create a view query from the Control Center.
- ræı »
- ræű ô
- q╧ÿ≤S,,,,,,
- QC1
- a7,G,,,,,,
- a8,P,,,,&H0D,,
- a8,C,D002,,,&H003F,,
- *501120
- C14,1
- rìê± ╖
- rìë± ╖
- rìè± ╖
- rìï± ╖
- rìì± ░
- q╧ÿ╕N,,,,,,
- a7,C,D502,,,,,