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3 Cards in this Set
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Logical operators in database queries < Less than > Greater than NOT AND OR SELECT* FROM pets WHERE Age < 7 AND Type NOT (Dog) |
Primary and Foreign keys Primary and Foreign keys are used to link related records in different tables. Primary key is a unique identifier. Foreign key is a value which is the primary key of a record in another table. |
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Data validation Data validation is used to make sure the data entered meets set rules Length check=Data entered is correct length eg 6 characters for a password Format check=Data is in the correct format Range check=Data is within a specific range eg age is between 1-150 Presence check=Data has been entered eg user must enter a password Match checker=Data must be one of a number of specific options eg male or female |
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