PostgreSQL 子查询总数和百分比

Question

表格有销售额，我正在尝试计算销售额和占总额的百分比。

WITH t1 AS (
    SELECT
    product_id,
    sum(financial_charge_cents) as cents
    FROM "account_charges"
    WHERE account_id = 5
    AND status = 'Charged'
    GROUP BY product_id
    ORDER BY cents DESC
)
SELECT 
    product_id, 
    cast(cents as money) / 100.0 AS dollars, 
    cents / (sum(cents) OVER (PARTITION BY product_id)) as percent
FROM t1
ORDER BY dollars DESC

但这会将所有百分比返回为 1 并且不确定原因。

不确定这是类型问题还是什么。

Answer 1

OVER (PARTITION BY produuct_id) 导致总和与 cents 相同。您不需要分区:

SELECT 
    product_id, 
    cast(cents as money) / 100.0 AS dollars, 
    cents* 1.0 / (sum(cents) OVER ()) as percent
FROM t1
ORDER BY dollars DESC

请注意，我添加了 *1.0 以获得数字结果。如果 cents 是数字(不是整数)，请跳过它。