mysql - MySQL查询将求和，但如果在其他字段中声明

Question

我在使用 mysql 查询时遇到问题，我想用 else if 语句选择 SUM，这就是我的故事。

我的查询：

SELECT SUM(s.total_revenue) AS sum_revenue, m.revenue_type AS revenue_type, d.campaignid AS placement_id
FROM ox_data_summary_ad_hourly AS s
INNER JOIN ox_banners AS d ON (d.bannerid = s.ad_id) 
INNER JOIN ox_campaigns AS m ON (m.campaignid = d.campaignid) 
INNER JOIN ox_clients AS a ON (a.clientid = m.clientid) 
WHERE a.type = 0
GROUP BY placement_id
LIMIT 0 , 30

并在上面查询得到如下结果：

我想生成查询：如果收入类型 = 4 将改变值 sum_revenue = 值放置_id，示例结果我想如下图所示：

谢谢你帮助我。

Answer 1

您可以使用CASE表达式来获取结果：

SELECT 
    case 
        when m.revenue_type = 4 
        then d.campaignid 
        else SUM(s.total_revenue) end AS sum_revenue, 
    m.revenue_type AS revenue_type, 
    d.campaignid AS placement_id
FROM ox_data_summary_ad_hourly AS s
INNER JOIN ox_banners AS d 
    ON (d.bannerid = s.ad_id) 
INNER JOIN ox_campaigns AS m 
    ON (m.campaignid = d.campaignid) 
INNER JOIN ox_clients AS a 
    ON (a.clientid = m.clientid) 
WHERE a.type = 0
GROUP BY placement_id
LIMIT 0 , 30

Answer 2

SELECT case when m.revenue_type = 4 then d.campaignid else SUM(s.total_revenue) AS sum_revenue end, m.revenue_type ASincome_type, d.campaignid AS placement_id FROM ox_data_summary_ad_hourly AS s INNER JOIN ox_banners AS d ON (d.bannerid = s .ad_id) INNER JOIN ox_campaigns AS m ON (m.campaignid = d.campaignid) INNER JOIN ox_clients AS a ON (a.clientid = m.clientid) WHERE a.type = 0 GROUP BY placement_id LIMIT 0 , 30