websites

websites

1. html

   • language to create webpages
   • hyperlink
     • a url to another website that is where the link comes in,in hyper(link)
   • metatag
     • these are tags put into a web page to provide info about a page used by search tags
   • CSS
     • CSS=CASCADING STYLE SHEET
       • its to define the formatting of elements of web page
         • such as , hyperlinks by defining colour ,font and text alignment

2. flat file

   • a single table not linked to any other table

3. key field

   • a field or a set of the values of which uniquely identify a record

4. presence check

   • this checks that data has been filled in and hasn't left blank

5. design stage

   • attribute
     • a entity
       • created at the design stage
         • an entity becomes a table in the database
     • created at design stage
     • an attribute becomes a field in a data base

6. diffrent keys types

   • candidate key
     • a field that could be considered for the primary key spot
   • surrogate key
     • a field that is made up if there is no suitable candidate key
       • for example, order ID
   • primary key
     • a key that uniquely identifiles a record
       • this key is also a required field
   • foreign key
   • compound primary key