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13 Cards in this Set
- Front
- Back
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Text |
Allows letters, numbers and symbols |
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Numbers |
Whole or decimal numbers |
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Date |
Only allows dates |
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Time |
Accepts formats 18:21, 6:21pm |
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Graphics |
Used for images |
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OLE object |
Used for images |
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Calculated |
Performs calculations on text, number, date and time |
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Data |
Is a result of a formula |
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Link |
A reference to a file stored outside the database |
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Boolean |
Used when field value has one or two states. Yes/no on/off true/false |
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Foreign key |
One of the database tables is a key from another table that refers to a specific key |
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Primary key |
It has to be unique |
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Primary key |
Cannot be left empty |
