Oracle数据库中nvl函数的使用示例有哪些

1. 使用nvl函数将null替换为特定值:

SELECT name, nvl(age, 0) as age FROM employees; 

2. 使用nvl函数将null替换为字符串:

SELECT name, nvl(department, 'N/A') as department FROM employees; 

3. 使用nvl函数将null替换为另一个列的值:

SELECT name, nvl(salary, bonus) as total_compensation FROM employees; 

4. 使用nvl函数在条件判断中替换null:

SELECT name, CASE WHEN nvl(salary, 0) > 50000 THEN 'High' ELSE 'Low' END as salary_category FROM employees;