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By Peter Gosling (auth.)

ISBN-10: 0333640691

ISBN-13: 9780333640692

ISBN-10: 1349137871

ISBN-13: 9781349137879

ISBN-10: 1551551551

ISBN-13: 9781551551555

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Sample text

5. Setting up a database table Records REf'l'l) T\'PE ADDRESS! 4 This detached bungalow comprises one reception room, two bedrooms, bathroom, hall, kitchen, garage space and a small walled garden. It is situated in a small village outside a busy market town and is within easy driving distance of shops. There is a regular bus service past the door. Central heating is by electric night store heaters. 2 Using Paradox When using the Paradox database management program you will find that from the start all database files are referred to as tables, and they always are displayed as such.

These are records 4 and 7. ,. 1 2 3 4 5 b 7 B 9. 19, and select the Edit option from this. Highlight the first record to be deleted and press the Delete key. The record disappears. 20 shows the screen after the deletion and when the next record to be deleted is highlighted. Notice that this has now become record number 6, since number 4 has gone and the record numbers have been changed. 22. If you choose DO-IT! the records will be finally deleted but if you choose Cancel the deletion process is reversed and the database table will remain unchanged.

All that needs to be said at the moment is that in order to find not record number 47, but the record where a particular field has a particular piece of data stored in it, if there was no quick way of finding that data, then the system would have to revert to the inefficient methods used when tape was the major storage medium. Do not, however, think that tape methods are dead and gone. Magnetic tape provides an easy and cheap way of archiving data. Since many database tables are transient and change from day to day, it is good practice to make backup copies of the data they contain on, very often, a daily basis.

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Mastering Databases by Peter Gosling (auth.)

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