Database Design
Muhtasari
Nobody ever writes a database twice. The design decisions made in the first hour, which tables exist, what each field holds and which field identifies a record, are the ones everything afterwards is built on, and they are the ones that are painful to change once there is real data in the system. Getting them right is a skill, and it is a skill made of three specific choices rather than of general good taste.
This lesson teaches those three choices: picking an appropriate data type, and a length where a length is called for; selecting a suitable primary key; and turning a paragraph describing a situation into a set of linked tables. You will also learn the exact notation this specification uses to write a design down, which is worth knowing precisely, because a design written in the expected form is quick to mark and a design sketched informally is not.
Malengo
- Be able to choose appropriate data types and (where appropriate) lengths for fields in a table. Be able to select a suitable primary key for a table. Be able to produce a design for a relational database from a description of a scenario.
Ramani ya mawazo
Mada hii imechorwa ili uone jinsi mawazo yanavyounganika.
Fungua ramani ya mawazo kwenye programu
Maelezo ya Somo
Dokezo Kamili la Somo Linapatikana kwenye Programu ya Green Bridge
Pata programu ya Green Bridge CBT kwenye simu au kompyuta yako kwa maktaba kamili ya IGCSE: mitihani ya miaka iliyopita, miongozo ya usahihishaji, ramani za mawazo, kadi za marudio na masomo ya sauti.
Tathmini ya Somo
Hongera kwa kukamilisha somo la Database Design. 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.
- Which data type is most appropriate for a field storing a telephone number? A. Integer B. Real C. String D. Boolean Answer: C
- For which of these fields is it appropriate to give a length? A. A Boolean field recording whether a fee has been paid B. A string field holding a surname C. An integer field holding a quantity D. A real field holding a price Answer: B
- In the notation used by this specification, how is the primary key of a table indicated? A. It is written in capital letters B. It is underlined C. It is placed in square brackets D. It is written last in the list Answer: B
- One member may make many bookings, and each booking is made by one member. Where should the foreign key be placed? A. In the Member table B. In the Booking table C. In both tables D. In neither table Answer: B
- What is the maximum number of tables the specification says an examined design scenario will require? A. Two B. Three C. Four D. There is no limit Answer: B
Fanyia kazi maswali haya kwenye programu
Fanyia kazi maswali haya kwenye programu
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Database Design? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
Pakua Programu Kwenye Google Playstore
Kila kitu unachohitaji ili kufaulu katika JAMB, WAEC & NECO.
