Databases
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This document discusses structured and unstructured data, with examples of each. It also defines key database concepts like fields, records, primary keys, and how relational databases split data across tables and link them together using foreign keys. Relational databases reduce data duplication by separating data into normalized tables that can be joined through common primary and foreign keys.
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Databases
- 2. Structured & Unstructured Data You need to be able to name some examples of structured and unstructured data. Presentations DocumentsPhotos Videos Unstructured Data Customer DetailsAddress Book Train Timetable Structured Data Databases are used to store structured data.
- 3. Key Terms One piece of information.FIELD All of the data or information about one item.RECORD Student_ID First_Name Last_Name Address DOB Gender 1 John Curtis 12 Brook Lane 21/03/1990 Male 2 Ben Jackson 1 Totters Lane 15/04/1990 Male 3 Sarah Smith 60 Belsize Rd 6/06/1990 Female A unique identifier for each record.PRIMARY KEY
- 4. Relational Databases Relational databases split data across different tables to reduce duplication. A foreign key is used to link tables together and create a relationship between them. It is a field in one table that is linked to the primary key in another table. Student_ID First_Name Last_Name Address DOB Gender Class_ID Student_ID Subject Teacher_ID
- 5. One piece of information.FIELD All of the data or information about one item.RECORD A unique identifier for each record. PRIMARY KEY