Comments indicates that what follows should be ignored by the PL/SQL interpreter.
Comments can explain some hidden rules or logic in the code to other developers.
PL/SQL allows two types of comments: single and multi-line.
Single-line comments start with a delimiter --and go to the end of the line:
declare -- here you should declare variables, -- constants, etc. ... begin -- here you place your code ... end;
Multi-line comments start with /* and end with */.
These delimiters may span as many lines as needed. An example is shown here:
declare /* This code is written by book2s.com Dec 20 2018 */ ... begin ... end;