在SQL語(yǔ)句中,可以使用rank()函數(shù)與其他窗口函數(shù)配合使用來(lái)實(shí)現(xiàn)更復(fù)雜的查詢需求。rank()函數(shù)通常用于為查詢結(jié)果集中的行賦予一個(gè)排名,常與order by子句一起使用。以下是一些與rank()函數(shù)配合使用的例子:
SELECT department, sales, RANK() OVER(ORDER BY sales DESC) AS sales_rank
FROM sales_data;
SELECT department, sales, RANK() OVER(ORDER BY sales DESC) AS sales_rank,
DENSE_RANK() OVER(ORDER BY sales DESC) AS dense_sales_rank
FROM sales_data;
SELECT department, sales,
RANK() OVER(ORDER BY sales DESC) AS sales_rank,
(sales - LAG(sales) OVER(PARTITION BY department ORDER BY month)) / LAG(sales) OVER(PARTITION BY department ORDER BY month) AS sales_growth_rate
FROM sales_data;
通過(guò)與其他窗口函數(shù)的配合使用,可以實(shí)現(xiàn)更加靈活和復(fù)雜的查詢需求,幫助分析數(shù)據(jù)并生成更有意義的報(bào)告。