Create A Database Structure
Akopọ
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.
Awọn Afojusun
- 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.
Ẹ̀kọ́ Ohùn
Gbọ́ ẹ̀kọ́ yìí nínú áàpù
Àwòrán ọpọlọ
A ti ṣe àwòrán kókó yìí kí o lè rí bí àwọn èrò ṣe so pọ̀.
Ṣí àwòrán ọpọlọ nínú áàpù
Káàdì ìrántí
Ìdánrawò kíákíá lórí ohun tí wọ́n ń dán wò nínú kókó yìí.
Ṣe ìdánrawò káàdì wọ̀nyí nínú áàpù
Akọ̀wé Ẹ̀kọ́
Àkọsílẹ̀ Ẹ̀kọ́ Pípé wà lórí Ohun Èlò Green Bridge
Gba ohun èlò Green Bridge CBT sórí fóònù tàbí kọ̀mpútà rẹ fún gbogbo ilé ìkàwé IGCSE: ìwé ìdánwò àtijọ́, ìlànà ìdíwọ̀n, àwòrán èrò, káàdì ìkẹ́kọ̀ọ́ àti ẹ̀kọ́ ohùn.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Create A Database Structure. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- 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
Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
-
Abala ìwé ẹ̀kọ́
Relational Database Management Systems
"Introduction to Computer Science: Relational Database Management Systems" by OpenStax, OpenStax, Rice University, licensed under CC BY-NC-SA 4.0 (https://creativecommons.org/licenses/by-nc-sa/4.0/). Source: https://openstax.org/books/introduction-computer-science/pages/8-3-relational-database-management-systems. Access for free at https://openstax.org/books/introduction-computer-science/pages/1-introduction
Àwọn àjọ mìíràn ló tẹ̀ wọ́n jáde lábẹ́ ìwé àṣẹ ṣíṣí, a sì dá wọn lọ́lá bí wọ́n ṣe béèrè. Àwọn ìjápọ̀ ń ṣí ojú òpó wọn.
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Create A Database Structure? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
Ṣe igbasilẹ ohun elo naa lori Google Playstore
Gbogbo ohun ti o nilo lati ṣe dara julọ ninu JAMB, WAEC ati NECO.
