CASE « PL SQL Statements « Oracle PL/SQL Tutorial

22.2.1.CASE statements
22.2.2.When creating selector CASE statements, you cannot have NULL in the list of possible values.
22.2.3.Use CASE statement
22.2.4.Named case block when
22.2.6.An example of comparison of two numbers using a searched CASE expression
22.2.7.Variable assignment with case statement
22.2.8.Use case statement in a dbms_output.put_line
22.2.9.Simple CASE statement with range

22.2.10.Case statement to call procedure
22.2.11.Return statement with case
22.2.12.Use case statement in procedure call to use the proper parameter value