MySQL query will SUM but if statement in other field

Question

I am having trouble with a mysql query, I want to select SUM with else if statement, this is my story.

My query:

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

And query in above get result as below:

I want to generate query which: If revenue_type=4 will change in value sum_revenue = value placement_id, Example result I want to as image below:

Thanks for help me.

Answer 1

You can use a CASE expression to get the result:

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 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