Computer Science - 0478 CIE

Databases

Bayani Gaba-gaba

Almost every organisation stores data: a shop's stock, a school's students, a library's books. A database is how that data is kept in a structured way so it can be searched, sorted and totalled in an instant. This topic shows you how a single-table database is built and how to pull exactly the data you want out of it using SQL.

You will learn how to define a single-table database from a set of requirements, choose suitable data types for each field, understand and pick a primary key, and read, complete and write SQL queries using SELECT, FROM, WHERE, ORDER BY, SUM and COUNT. By the end you should be able to design a table and query it confidently, just as the exam expects.

Manufura

1 Define a single-table database from given data storage requirements
2 Suggest suitable basic data types
3 Understand the purpose of a primary key and identify a suitable primary key for a given database table
4 Read, understand and complete structured query language (SQL) scripts to query data stored in a single database table

Takardar Darasi

Databases sit behind nearly every website, app and business system, and SQL is a near-universal language for querying them, the same SQL works across almost any database software. The exam asks you to design a single-table database and to read and complete SQL scripts, so these are directly examined, practical skills.

Akwai a cikin manhajar Green Bridge

Zazzage manhajar Green Bridge CBT a wayar ka ko kwamfyuta ka don samun cikakkiyar bayanan darasi, tambayoyin aiki, da ƙari.

Cikakkiyar bayanan darasi tare da zane-zane

Mataimakiyar koyo da AI

Yi karatu ba tare da intanet ba, a kowane lokaci, a ko'ina

Zazzage manhajar wayar hannu Zazzage manhajar kwamfyuta

Akwai a Android, Windows, macOS, da Linux

Nazarin Darasi

Barka da kammala darasi akan Databases. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.

Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.

Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.

In a database, a single row containing all the fields about one object is called a: A. field B. record C. table D. query Answer: B
Which data type is most suitable for a price such as 3.99? A. integer B. Boolean C. real D. character Answer: C
What is the main purpose of a primary key? A. to sort the records B. to uniquely identify each record C. to count the records D. to encrypt the data Answer: B
Which SQL clause is used to return only records that meet a condition? A. ORDER BY B. SELECT C. WHERE D. COUNT Answer: C
Which SQL function counts how many records meet a condition? A. SUM B. COUNT C. ORDER BY D. TOTAL Answer: B