Create A Database Structure
Overzicht
Behind almost every app you use sits a database: the contacts on a phone, the stock in a shop, the members of a club. A database only works well if its structure is right from the start. Choose the wrong field type and a price loses its pennies; forget a key and two people with the same name become impossible to tell apart. Getting the structure right is the quiet skill that makes everything else, the searches, the calculations and the reports, possible later.
In this lesson you will learn how data is organised into fields and records, the difference between a flat file and a relational database, and how to pick the correct data type for every field. You will meet primary and foreign keys and see how they link two tables together, and you will design a clear data entry form. These are the foundations of the practical database papers, so master them and the rest of the Databases unit falls into place.
Doelstellingen
- Create an appropriate database structure.
- Import data from existing files (including .csv, .txt) using specified field names to create tables Set appropriate data types to fields including text, numeric (integer, decimal, currency), date/time, Boolean/logical Set sub-types of numeric data including percentage, number of decimal places Set display format of Boolean/logical field (yes/no, true/false, checkbox) Set display format of date/time data Create and edit primary and foreign keys Create relationships between tables.
- Create and use a data entry form.
- Create a data entry form including specified fields, appropriate font styles and sizes, appropriate spacing between fields, character spacing of individual fields, use of white space, radio buttons, check boxes, drop down menus.
- Types of database.
- Characteristics, uses, advantages and disadvantages of a flat file and a relational database.
- Primary and foreign keys.
- Characteristics of primary key and foreign keys.
- Form design.
- Characteristics of good form design.
Lesnotitie
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Lesevaluatie
Gefeliciteerd met het voltooien van de les op Create A Database Structure. Nu je de sleutelconcepten en ideeën, het is tijd om uw kennis op de proef te stellen. Deze sectie biedt een verscheidenheid aan oefeningen vragen die bedoeld zijn om uw begrip te vergroten en u te helpen uw begrip van de stof te peilen.
Je zult een mix van vraagtypen tegenkomen, waaronder meerkeuzevragen, korte antwoordvragen en essayvragen. Elke vraag is zorgvuldig samengesteld om verschillende aspecten van je kennis en kritisch denkvermogen te beoordelen.
Gebruik dit evaluatiegedeelte als een kans om je begrip van het onderwerp te versterken en om gebieden te identificeren waar je mogelijk extra studie nodig hebt. Laat je niet ontmoedigen door eventuele uitdagingen die je tegenkomt; beschouw ze in plaats daarvan als kansen voor groei en verbetering.
- In a database table, a single column of one type of data is called a: A. Record B. File C. Field D. Key Answer: C
- Which data type is most suitable for a field that stores a telephone number? A. Numeric integer B. Text (alphanumeric) C. Currency D. Boolean Answer: B
- A field that holds unique data and identifies each record is the: A. Foreign key B. Primary key C. Index field D. Validation field Answer: B
- Which statement about a relational database is correct? A. It stores all data in one single table B. It always searches faster than a flat file C. It stores each item of data once and links tables with relationships D. It cannot use primary keys Answer: C
- A validation check that makes sure a required field has not been left empty is a: A. Range check B. Length check C. Format check D. Presence check Answer: D
Beschikbaar in de Green Bridge-app
Download de Green Bridge CBT-app op je telefoon of computer voor toegang tot volledige lesnotities, oefenvragen en meer.
Beschikbaar in de Green Bridge-app
Download de Green Bridge CBT-app op je telefoon of computer voor toegang tot volledige lesnotities, oefenvragen en meer.
Aanbevolen Boeken
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