How to use the lower (), UPPER () function when Oracle database operations

How to use Oracle LOWER () and UPPER () functions

A column returns rows that are case-insensitive
This is a common practice to make columns case-insensitive to ensure that you want to return all rows.

SELECT *
From courses
WHERE LOWER (education_delivery_method) = ' classroom '

You can use the Oracle upper () or LOWER () function to select Format columns in your SQL

SELECT
UPPER (FIRSTNAME) as "FIRSTNAME",
LASTNAME
From STUDENTS
WHERE RowNum <

Format one column use up and down features
It can use the Oracle UPPER () or LOWER () function functions with the string () to complete different types of formatting.

SELECT
UPPER (SUBSTR (lastname,1,1)) | | LOWER (SUBSTR (lastname,2,29))
From STUDENTS
WHERE RowNum <

Update changes to a set of rows
It can be used in conjunction with an UPDATE statement Oracle's UPPER () or LOWER () function to change a set of rows in the "case".

UPDATE STUDENTS
set    LASTNAME = UPPER (LASTNAME)
where  lastname  ; = ' Jones '  
/

COMMIT WORK;