mysql - SQL query to identify pairs with duplicates -

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i'm trying write query pair impressions , conversions same ip address in database. have table of impressions , ip addresses, , impression can of type 'view' or 'conversion' (defined in column 'name').

so basically, need identify groups of records same ip address, contain both view , conversion.

after hour of googling i've got far below, isn't far should give idea of objects involved:

select ip_address, name, count(1) cnt  impressions group ip_address, name;

can advise on best way this?

you need use having clause conditional count. need remove name group by treat 2 different types separately.

select  ip_address,          count(case when name = 'view' 1 end) views,         count(case when name = 'conversion' 1 end) conversions,         count(1) cnt     impressions group ip_address having  count(case when name = 'view' 1 end) > 0 ,     count(case when name = 'conversion' 1 end) > 0;

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