By Martyn Prigmore
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Additional resources for An introduction to databases with web applications
The relational data model is a popular data model used to organize many databases. It has a simple solution to organizing data, which is that all data are gathered into tables with rows and columns. In the Staff Directory database, a Staff table holds contact details for members of staff. Each row of the Staff table holds the contact details for one member of staff. Every row has exactly the same structure – the six columns staffNo, fname, lName, phone, email and photo. On a given row, the columns hold items of data about a particular member of staff.
The staff name includes their title (‘Dr’, ‘Prof’, and so on), but only gives the first initial, not the full forename. Also, their job title is included, but there is no photo. 7 includes dynamic content, but the data is stored in a text file, not on a database. 8. It is an example of a ‘comma separated values’ file. Each line holds the contact details for one member of staff, with commas separating the individual data values from one another. Notice that, in the second line, there are two commas with only a space character between them immediately after the staff name.
2 discusses networks, with an emphasis on how information, in the form of network messages, is transported across the network. It examines the problems that arise when distinct networks are interconnected to allow information sharing between networks and how the TCP/IP suite of protocols overcome these problems. 3 looks at database technologies. It focuses first on the server-side technologies, in particular the database management system (DBMS), and introduces the ANSI/SPARC database systems architecture.