Oracle UPPER function
Description
The Oracle UPPER() function returns a specified character expression in UPPERCASE letters.
Uses of Oracle UPPER Function
- Standardizing Text: Convert all characters in a string to uppercase for uniformity.
- Case-Insensitive Comparisons: Facilitate case-insensitive string comparisons by converting both strings to uppercase.
- Data Cleaning: Ensure consistent data entry by converting input to uppercase.
- Display Formatting: Prepare text for display where uppercase is required.
Syntax:
UPPER(string1)
Parameter:
| Name | Description | Data Types |
|---|---|---|
| string1 | The given character expression. | CHAR, VARCHAR2, NCHAR, NVARCHAR2, CLOB, or NCLOB |
Return Value Type
CHAR, VARCHAR2, NCHAR, NVARCHAR2, CLOB, or NCLOB
Note : For linguistic-sensitive uppercase, refer to NLS_UPPER.
Applies to
Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i
Pictorial Presentation
Examples: Oracle UPPER function
The following example returns each employee's last name in uppercase:
SELECT UPPER(last_name) "Uppercase"
FROM employees;
Sample Output:
Uppercase ---------------- ABEL ANDE ATKINSON AUSTIN BAER BAIDA BANDA BATES . . .