如何在oracle脚本中为表名使用变量

I have an pl\sql script where I want to set the table name used in the script to a variable. So, from some examples I found on the web, I wrote the code below. The first section works, so I think my general syntax is correct,but the second section, where I attempt to use a variable for a table name it errors ("I have an pl\sql script where I want to set the