Notes regarding databases for gcses and a level. Detailed explanation of the most important topic for Computer systems. Helps with homework and better exam results.
Written by a previous student, so included only the most essential material.
DATA = piece of information. Numbers, words or pictures without context or meaning.
- E.g. 7, blue
INFORMATION = is data that has context. A collection of words, numbers or pictures which
have meaning.
- E.g. I sold 7 blue cars.
BASE
- a database is a collection of data that can be accessed as information or information
which is stored in a logical, organised or structured way.
Database is mostly used for large organisations.
DATABASE STRUCTURE
A FILE or TABLE is the collection of all the database records on one topic or subject.
A RECORD is all of the information about one person/thing.
A FIELD is the type of or piece of information.
PROs and CONs of PAPER vs ELECTRONICS
Paper Electronics
PROs CONs PROs CONs
Cheap to set up Searching is difficult Easily to make Can be expensive
back-ups
Don't need Updating is difficult Easily make If there’s a power
electricity changes. cut you can't use it.
Don't need training Not environmentally Portable; cloud. You need training to
beneficial learn how to use it.
Can be lost Easily sort data
Can’t easily make Easy to search for
backup copies particular records
Can import or export
data to/from other
packages.
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