Oracle NLS_UPPER function
Description
The NLS_UPPER function is used to return all letters of a given string in uppercase, taking into account linguistic conventions based on the National Language Support (NLS) parameters.
Note : National Language Support (NLS) is a technology enabling Oracle applications to interact with users in their native language, using their conventions for displaying data.
Uses of Oracle NLS_UPPER Function
- Converting Text to Uppercase: Transforms all characters in a string to uppercase.
- Supporting Multiple Languages: Handles uppercase conversions according to linguistic rules for various languages.
- Data Cleaning and Normalization: Normalizes text data to uppercase for consistent storage and processing.
- Preparing Data for Comparison: Ensures case-insensitive comparisons by converting text to uppercase.
- Formatting User Inputs: Standardizes user inputs to uppercase.
- Enhancing Data Presentation: Formats text data for consistent presentation in reports, GUIs, and other interfaces.
Syntax:
NLS_UPPER(string1 [, 'nlsparam' ])
Parameters:
| Name | Description | Data Types |
|---|---|---|
| string1 | A string whose characters will be converted to uppercase. | CHAR, VARCHAR2, NCHAR, NVARCHAR2, CLOB, or NCLOB |
| nlsparam | The value of 'nlsparam' can have this form : 'NLS_SORT = sort' where sort is either a linguistic sort sequence or BINARY. The linguistic sort sequence handles special linguistic requirements for case conversions. These requirements can result in a return value of a different length than the char. If you omit 'nlsparam', then this function uses the default sort sequence for your session. |
Return Value Type
VARCHAR2
Examples: Oracle NLS_UPPER function
The following example returns a string with all the letters converted to uppercase:
SELECT NLS_UPPER('w3resource') "Uppercase"
FROM DUAL;
Sample Output:
Uppercase ---------- W3RESOURCE