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Oracle Tips by Burleson 

Code Readability in PL/SQL

Code readability is important when programming.  Many times lines can be combined to reduce the size of the code but may make the code less understandable to anyone other than the author.  The example shown earlier can in fact be written with only three lines of code.

 SQL> begin
  2    dbms_output.put_line ('Hello &v_string');
  3  end;
  4  / 

Enter value for v_string: John
Hello John

White Space and Comments

As with any programming, you want your script to be as readable as possible.  Remember, you may be writing the procedure but more than likely someone else will have to update and maintain it. 

White space is added to make code more readable.  It has no impact on the execution time or efficiency of the code.  White space is use only to make the code more readable to humans.  In the examples above, the code between the begin and end key word is indented.  This makes the block boundaries easier to see in the code.  The two spaces forming the indent exists only to make the code easier to read.  Blank lines can also be used to separate sections of code.  Blank lines can appear anywhere in the code (except inside a SQLstatement).

The above book excerpt is from:

Easy Oracle PL/SQL Programming

Get Started Fast with Working PL/SQL Code Examples

ISBN 0-9759135-7-3   

John Garmany

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