In this plsql oracle tutorial we write one sample pl/sql block in which we understand where to declare pl sql variable and where to initialize plsq variable
Oracle SQL Complete Tutorial/Training/Course for the beginner:
https://www.youtube.com/watch?v=3v4s3XMw4q0&list=PLiLpmqwkwkCt0QeXD8j7BwIoOaBGBRrZC
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