Returns character data, with all letters uppercase. The character data can be of the data types
VARCHAR2. The return value is the same data type as the character data. The database sets the case of the characters based on the binary mapping defined for the underlying character set.
See the syntax of the
UPPER function in Oracle Database SQL Language Reference.
The following restrictions apply when you use the
TOUPPER function in the
The function does not support LOB data types, including
BFILE data types.
The function does not support national character set data types, including
NCLOB data types.
This example shows each
problem_key in all uppercase letters.
select toupper(problem_key) from problem;