Information and Communication Technology - 0417 CIE

Create A Database Structure

Muhtasari

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.

Malengo

  1. Create an appropriate database structure.
  2. 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.
  3. Create and use a data entry form.
  4. 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.
  5. Types of database.
  6. Characteristics, uses, advantages and disadvantages of a flat file and a relational database.
  7. Primary and foreign keys.
  8. Characteristics of primary key and foreign keys.
  9. Form design.
  10. Characteristics of good form design.

Somo la Sauti

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Ramani ya mawazo

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Fanya mazoezi ya kadi hizi kwenye programu

Maelezo ya Somo

A database is simply an organised collection of data, and a database program is the software that stores and retrieves that data in a structured way. The structure you build decides what the database can do. A well-structured database stores each fact once, protects itself from bad data, and lets you pull out exactly the records you need in seconds. A badly structured one repeats data, allows errors in, and becomes slow and unreliable. Every later skill in this unit, searching, calculating and reporting, depends on the structure you set up here.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Create A Database Structure. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.

Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.

Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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

Fanyia kazi maswali haya kwenye programu

Fanyia kazi maswali haya kwenye programu

Vitabu Vinavyopendekezwa

Cambridge IGCSE and O Level Information and Communication Technology
Cambridge IGCSE and O Level Information and Communication Technology
Manukuu: Third edition
Mchapishaji: Hodder Education
Mwaka: 2021
ISBN: 978-1-3983-1854-0
Maelezo: Endorsed coursebook covering the full 0417/0983 syllabus, theory and practical, with worked examples and exam-style questions.
Cambridge IGCSE Information and Communication Technology Theory Workbook
Cambridge IGCSE Information and Communication Technology Theory Workbook
Manukuu: Second edition
Mchapishaji: Hodder Education
Mwaka: 2021
ISBN: 978-1-3983-1856-4
Maelezo: Companion theory workbook with additional exercises across the syllabus theory topics.

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