NVL
NVL
The NVL function substitutes an alternate value for a NULL value.Syntax
NVL( Arg1, replace_with )
The SELECT statement below will display 'n/a' if an employee has been not assigned to any job yet i.e. JOB_ID is NULL. Otherwise, it would display the actual JOB_ID value.
SELECT first_name, NVL(JOB_ID, 'n/a')
FROM employees;
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