What Is PL/SQL Language Case Sensitive

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What Is PL/SQL Language Case Sensitive? - Oracle DBA FAQ - Understanding PL/SQL Language Basics

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A

PL/SQL language is not case sensitive:

Reserved words are not case sensitive. For example: CASE and Case are identical.
Variable names and other names are not case sensitive. For example: TOTAL_SALARY and total_salary are identical.

But values in string literals are case sensitive. For example: 'DBA' and 'dba' are different.

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