Keywords and user-defined identifiers that are used in an SPL program are not case-sensitive.

For example, DBMS_OUTPUT.PUT_LINE('Hello World'); is interpreted as the same content as dbms_output.put_line('Hello World');, Dbms_Output.Put_Line('HelloWorld');, or DBMS_output.Put_line('HelloWorld');.

Character and string constants are case-sensitive. Data retrieved from PolarDB-O or obtained from other external sources is also case-sensitive. The DBMS_OUTPUT.PUT_LINE('Hello World!') ; statement generates the following output:

Hello World!

However, the DBMS_OUTPUT.PUT_LINE('HELLO WORLD!') ; statement generates the following output:

HELLO WORLD!