This function is used to convert all characters of a string to the upper case.
Syntax
upper(string A)
or
ucase(string A)
Parameters
Parameter |
Mandatory |
Type |
Description |
|---|---|---|---|
A |
Yes |
STRING |
Text string to be converted |
Return Values
The return value is of the STRING type.
- If the value of the input parameter is not of the STRING, BIGINT, DOUBLE, DECIMAL, or DATETIME type, an error is reported.
- If the value of the input parameter is NULL, NULL is returned.
Example Code
Converts lowercase characters in a string to the upper case. An example command is as follows:
The value ABC is returned.
select upper('abc');
The value of the input parameter is NULL. An example command is as follows:
The value NULL is returned.
select upper(null);