在Oracle数据库中,STDDEV
函数用于计算某列数值的标准偏差
以下是一些示例,展示了如何在Oracle中将STDDEV
函数与其他统计函数结合使用:
SELECT SUM(sales) AS total_sales,
AVG(sales) AS average_sales,
STDDEV(sales) AS sales_stddev
FROM sales_table;
SELECT department_id,
AVG(salary) AS avg_salary,
MIN(salary) AS min_salary,
STDDEV(salary) AS salary_stddev
FROM employees
GROUP BY department_id;
SELECT product_category,
AVG(sales) AS avg_sales,
MAX(sales) AS max_sales,
STDDEV(sales) AS sales_stddev
FROM products
GROUP BY product_category;
这些示例展示了如何在Oracle中将STDDEV
函数与其他统计函数(如SUM
、AVG
、MIN
和MAX
)结合使用,以获取有关数据集的更全面的统计信息。