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creating a web site creating a web site 2 illustrates some of these relational database concepts. It has five columns and six rows, with each row representing a different employee. Employee_Number First_Name Last_Name Date_of_Birth Car_ Number 10001 Axel Washington 28-AUG-43 5 10083 Arvid Sharma 24-NOV-54 null 10120 Jonas Ginsburg 01-JAN-69 null 10005 Florence Wojokowski 04-JUL-71 12 10099 Sean Washington 21-SEP-66 null 10035 Elizabeth Yamaguchi 24-DEC-59 null The primary key for this table would generally be the employee number because each one is guaranteed to be different. (A number is also more efficient than a string for making comparisons.) It would also be possible to use First_Name and Last_Name because the combination of the two also identifies just one row in our sample database.

creating a web site Using the last name alone would not work because there are two employees with the last name of "Washington." In this particular case the first names are all different, so one could conceivably use that column as a primary key, but it is best to avoid using a column where duplicates could occur. If Elizabeth Taylor gets a job at this company and the primary key is First_Name, the RDBMS will not allow her name to be added (if it has been specified that no duplicates are permitted). Because there is already an Elizabeth in the table, adding a second one would make the primary key useless as a way of identifying just one row. Note that although using First_Name and Last_Name is a unique composite key for this example, it might not be unique in a larger database.

creating a web site Note also that Table 1.2 assumes that there can be only one car per employee. SQL is a language designed to be used with relational databases. There is a set of basic SQL commands that is considered standard and is used by all RDBMSs. For example, all RDBMSs use the SELECT statement.

creating a web site

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creating a web site