5128654
Beschreibung
Karteikarten von Anisha Rai, aktualisiert more than 1 year ago
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Erstellt von Anisha Rai
vor mehr als 8 Jahre
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| Frage | Antworten |
| What is an entity? | A real world object which can have information stored about it |
| What are attributes? | Details about the entity |
| What are relationships? | They connect separate tables that have things in common |
| What are the columns of a database table called? | The fields |
| What are the rows of a database table called? | The records |
| What is the primary key? | A filed that holds data that is unique for each record |
| How are relational databases linked? | Using primary key fields |
| What is a foreign key? | When the primary key filed from one table is included in another table so that they can be joined |
| Benefits of relational databases | Prevent data redundancy Does not take up as much space and memory Does not require new data to be added every time you enter a new record |
| What is a query? | A database search used to find specific records |
| How can logical operators be used in framing database queries? | They can be combined to narrow down the search |
| What is a form? | Used to enter data into a database Only required if the database needs a user to enter data Make it clear what data should be input |
| What is a report? | Used to export data Present data in a way that is easy to read |
| What is a module? | Pre-written programs You can edit modules in the programming language and add your own procedures |
| What is validation? | Database fields have validation rules to make sure that the data entered follows the expected format |
| What is a presence check? | Checks that something has been entered Checks the field is not empty (required fields) |
| What is a length check? | Checks that a certain number of characters have been entered |
| What is a range check? | Checks that any value entered is between a minimum and maximum value Only applies to numbers |
| What is a type check? | Checks the data type e.g. integer, decimal, string |
| What is a format check? | Checks the data follows the specified pattern of characters / digits e.g. dd/mm/yyyy to check a date An input mask is used to ensure that the data is in the required formated |
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