在Oracle數據庫中,STDDEV
函數用于計算某列數值的標準偏差
以下是一些示例,展示了如何在Oracle中將STDDEV
函數與其他統計函數結合使用:
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;
這些示例展示了如何在Oracle中將STDDEV
函數與其他統計函數(如SUM
、AVG
、MIN
和MAX
)結合使用,以獲取有關數據集的更全面的統計信息。