PostgreSQL UPPER() function
UPPER() function
The PostgreSQL upper function is used to convert a string from lower case to upper case.
Syntax:
upper(string)
PostgreSQL Version: 9.3
Pictorial Presentation of PostgreSQL UPPER() function

Example: PostgreSQL UPPER() function:
In the following example PostgreSQL upper function returns lower case to uppercase.
Code:
SELECT upper('w3resource');
Sample Output:
upper ------------ W3RESOURCE (1 row)
PostgreSQL UPPER() function using Column :
Sample Table: employees.
If we want to display the employee_id, first name, and first_name in upper case for those employees who belong to the department which department_id is 100 from employees table , the following SQL can be executed:
Code:
SELECT employee_id,first_name,
upper(first_name) "Upper case of first_name"
FROM employees
WHERE department_id=100;
Sample Output:
employee_id | first_name | Upper case of first_name -------------+-------------+-------------------------- 108 | Nancy | NANCY 109 | Daniel | DANIEL 110 | John | JOHN 111 | Ismael | ISMAEL 112 | Jose Manuel | JOSE MANUEL 113 | Luis | LUIS (6 rows)
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Next: ASCII function
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