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Data is organized in tables consisting of rows and columns This is a natural way of organizing data, and you re probably familiar with it through the use of spreadsheets Nevertheless, although there are some similarities, a database table is not an Excel worksheet For example, in a spreadsheet, you can assign data types to individual cells, while in a database, all the cells of a column have the same data type The column definitions, each with their name and the type of data permitted, represent the data structure of the table For example, a table of employees would probably include columns named FirstName, LastName, and SocialSecurityNumber containing strings of text; columns named EmployeeNumber and YearSalary containing numbers; and columns named DateOfBirth and EmployedSince containing dates The data associated with each employee would then all be stored into a row.

RSA encryption derives its name from the initials of its inventors, Ron Rivest, Adi Shamir, and Leonard Adleman of Massachusetts Institute of Technology It was developed during 1977 as a cooperative project, with Rivest and Shamir attempting to develop an unbreakable algorithm, and Adleman attempting to break each of their attempts When one was found that Adleman could not break, RSA was born Rivest, Shamir, and Adelman patented the algorithm and then licensed it to the company that they founded to capitalize on the algorithm, RSA Data Security, Inc (now RSA Security, Inc) A clear nonspecialist description of the workings of RSA encryption is at http://wwwlinuxjournalcom/article/6695 A similarly clear nonspecialist description of RSA within the OpenSSL environment is at http://wwwlinuxjournalcom/article/6826 RSA may be the most common encryption algorithm in commercial use today.

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A field is an individual data item within a table, corresponding to the intersection of a row and a column This would be a cell in a spreadsheet One or more columns can be identified as unique keys, used to identify each individual employee For this purpose, you could use one of the columns mentioned previously (eg, EmployeeNumber), or you could use the combination of first and last name The unique key used in preference over the others is called the primary key An additional type of key is the foreign key In this case, the column is defined as a reference (ie, a pointer) to a unique key of another table Besides avoiding duplication of data, this type of constraint increases the consistency of the database.

Then, the UI Command component reads its action attribute and uses the value to set the outcome, as shown in Figure 2 10.

For example, a table containing customer contracts could include a column pointing to the employee number defined in the employee table This would ensure that each contract would be associated with an existing salesperson..

It is built into modern browsers and is used automatically when they engage in secure transactions It has proven resistant to all attempts to break it, despite its inventors having described in general terms how to do it, and despite public knowledge of exactly how it works It has been successful partly because it uses an extremely large key; at least 1024 bits are normal for commercial applications It is therefore, quite properly, the asymmetric algorithm of choice As we have noted, however, both the size of the key and the nature of the algorithm make using RSA an expensive process; thus, one common use of it has been to protect the shorter keys being used in faster algorithms.

3: Set the outcome to "ok."

The DBMS can build an index for each key, so that the data can be retrieved more quickly. This will obviously slow down insertion and deletion of rows, because the DBMS will have to spend time updating the indexes, but most databases are more frequently interrogated than modified. Therefore, it usually pays to define indexes, at least those that can speed up the most common queries. Here you have a hint of another difference from Excel: in a database table, the data items are not moved around once they re inserted. Sometimes it s useful to present only some columns and rows, as if they were a table in their own right. Such virtual tables are called views. Under certain circumstances (we ll discuss this further when we describe individual statements later in this chapter), you can also use views to collect columns from different tables and handle them as if they belong to a single table. With a view, you consider the result of a database query as if it were a separate table.

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