UCASE or UPPER takes a character expression as a parameter and returns a string in which all alpha characters have been converted to uppercase. The syntax for UPPER case function as given in Oracle documents is as follows.
Syntax for Upper Function
UCASE or UPPER ( Character Expression )
If the parameter type is CHAR , the return type is CHAR. Otherwise, the return type is VARCHAR.
Note: UPPER and LOWER follow the database locale.
The length and maximum length of the returned value are the same as the length and maximum length of the parameter.
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