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Here I have three variables: a global package variable, G_VARIABLE; a formal parameter to the procedure, P_VARIABLE; and finally a local variable, L_VARIABLE. I name my variables after the scope they are contained in. All globals begin with G_, parameters with P_, and local variables with L_. The main reason for this is to distinguish PL/SQL variables from columns in a database table. For example, a procedure such as the following: create procedure p( ENAME in varchar2 ) as begin for x in ( select * from emp where ename = ENAME ) loop Dbms_output.put_line( x.empno ); end loop; end; will always print out every row in the EMP table, where ENAME is not null. SQL sees ename = ENAME, and compares the ENAME column to itself (of course). We could use ename = P.ENAME that is, qualify the reference to the PL/SQL variable with the procedure name but this is too easy to forget and leads to errors. I just always name my variables after the scope. That way, I can easily distinguish parameters from local variables and globals, in addition to removing any ambiguity with respect to column names and variable names.

You can build logical diagrams by using tools such as the Oracle Designer, or the Oracle Warehouse Builder if you are building a data warehouse If you wish, you can create rudimentary logical diagrams with nothing more than a pencil and paper In this section, you ll build a simple entity-relationship diagram describing a university, using entities called Student, Class, and Professor You ll use a rectangle to depict an entity, and a diamond shape to show relationships (as is common practice), although you could use different notations Let s assume the following relationship between two entities, Student and Class: A Student can enroll in one or more Classes A Class has one or more Students enrolled Data modeling starts out easy and then rapidly gets complex as you begin to ask questions and discover the various rules and constraints in force on the data.

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Here are the steps you need to follow to create the entity-relationship diagram: 1 Define your entities Student, Class, and Professor 2 Draw the entities using a rectangle to represent each one 3 For each of the entities in turn, look at its relationship with the others It doesn t matter which entity you begin with For example, look at the Student and the Professor Is there a relationship between these entities Well, a Professor teaches a class, and a student attends one or more classes, so at first glance there is a relationship between these entities But in this case it is an indirect relationship via the Class entity 4 Examine the Student and Class entities Is there a relationship Yes, a Student may attend one or more Classes One or more Students may attend a Class This is a many-to-many relationship 5.

Last Used Ext BlockId................... Last Used Block......................... PL/SQL procedure successfully completed.

spend the bulk of my time working with Oracle database software and, more to the point, with people who use this software Over the last 18 years, I ve worked on many projects successful ones as well as complete failures and if I were to encapsulate my experiences into a few broad statements, they would be An application built around the database dependent on the database will succeed or fail based on how it uses the database Additionally, in my experience, all applications are built around databases I cannot think of a single useful application that does not store data persistently somewhere Applications come, applications go The data, however, lives forever In the long term, the goal is not about building applications; it really is about using the data underneath these applications.

Now look at the Class and Professor entities One Professor teaches each Class and each Professor can teach many Classes However, if a Professor is absent (due to illness, for example), do you need to record the fact that a different Professor taught his or her Class on that occasion What if two Professors teach the same Class Do you need to record that information As a modeler, you need to address all questions of this nature so that your model is realistic and will serve you well 6 Assign the following attributes to the various entities: Student: Student ID, First Name, Last Name, Address, Year Professor: Staff ID, Social Security Number, First Name, Last Name, Office Address, Phone Number Class: Class ID, Classroom, Textbook, Credit Hours, Class Fee Look at the Textbook attribute in the Class entity You can use this attribute to illustrate an important point.

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