如何在存储过程中获取百分比

Question

我有一个存储过程，我通过它的计数来获取类别的存在。我想要它的总百分比。样本是我的总值。我需要样本中是或否的百分比。请帮忙。我的存储过程如下。

BEGIN

SELECT 

    SC.name as SC,
    SUM(IF(is_category_present = 1, 1, 0)) as YES,
    SUM(IF(is_category_present = 0, 1, 0)) as NO,
    COUNT(OC.outlet_id) as SAMPLE

FROM outlet_categories OC
INNER JOIN outlets O on O.id = OC.outlet_id
INNER JOIN sale_channels SC on SC.id = O.sale_channel_id

WHERE OC.month = month
AND CASE WHEN location_type = 1 THEN OC.zone_id = location
         WHEN location_type = 2 THEN OC.state_id = location
         WHEN location_type = 3 THEN OC.city_id = location

    END
AND OC.category_id = category_id

GROUP BY SC.id;

END

Answer 1

简单的计算应该可以工作：

(SUM(IF(is_category_present = 1, 1, 0))*1.0) / COUNT(OC.outlet_id) * 100.0 AS perc_yes
(SUM(IF(is_category_present = 0, 1, 0))*1.0) / COUNT(OC.outlet_id) * 100.0 AS perc_no