Contoh kueri ini mengasumsikan pengetahuan kerja tentang SQL dan BigQuery. Pelajari SQL di BigQuery lebih lanjut.
Kueri Transfer Data Campaign Manager 360
Mencocokkan variabel Floodlight dengan tabel sementara
Buat kecocokan antara variabel user_id dan Floodlight kustom di tabel aktivitas. Eksperimen ini kemudian dapat digunakan untuk menggabungkan data pihak pertama dengan data Campaign Manager 360.
/* Creating the match temp table. This can be a separate query and the
temporary table will persist for 72 hours. */
CREATE TABLE
temp_table AS (
SELECT
user_id,
REGEXP_EXTRACT(event.other_data, 'u1=([^;]*)') AS u1_val
FROM
adh.cm_dt_activities_attributed
GROUP BY
1,
2 )
/* Matching to Campaign Manager 360 impression data */
SELECT
imp.event.campaign_id,
temp.u1_val,
COUNT(*) AS cnt
FROM
adh.cm_dt_impressions AS imp
JOIN
tmp.temp_table AS temp USING (user_id)
GROUP BY
1,
2
Penayangan tayangan iklan
Contoh ini bagus untuk pengelolaan tayangan, dan menunjukkan cara menemukan jumlah tayangan yang ditayangkan di luar batas frekuensi atau jika calon pembeli tertentu tidak diperlihatkan iklan. Gunakan pengetahuan ini untuk mengoptimalkan situs dan taktik Anda untuk mendapatkan jumlah tayangan yang tepat kepada audiens terpilih.
/* For this query to run, @advertiser_ids and @campaigns_ids
must be replaced with actual IDs. For example [12345] */
WITH filtered_uniques AS (
SELECT
user_id,
COUNT(event.placement_id) AS frequency
FROM adh.cm_dt_impressions
WHERE user_id != '0'
AND event.advertiser_id IN UNNEST(@advertiser_ids)
AND event.campaign_id IN UNNEST(@campaign_ids)
AND event.country_domain_name = 'US'
GROUP BY user_id
)
SELECT
frequency,
COUNT(*) AS uniques
FROM filtered_uniques
GROUP BY frequency
ORDER BY frequency
;
Total jumlah / frekuensi cookie unik
Contoh ini membantu mengidentifikasi taktik dan format iklan yang menyebabkan peningkatan atau penurunan jumlah atau frekuensi cookie unik.
/* For this query to run, @advertiser_ids and @campaigns_ids and @placement_ids
must be replaced with actual IDs. For example [12345] */
SELECT
COUNT(DISTINCT user_id) AS total_users,
COUNT(DISTINCT event.site_id) AS total_sites,
COUNT(DISTINCT device_id_md5) AS total_devices,
COUNT(event.placement_id) AS impressions
FROM adh.cm_dt_impressions
WHERE user_id != '0'
AND event.advertiser_id IN UNNEST(@advertiser_ids)
AND event.campaign_id IN UNNEST(@campaign_ids)
AND event.placement_id IN UNNEST(@placement_ids)
AND event.country_domain_name = 'US'
;
Anda juga dapat menyertakan ID situs atau penempatan dalam klausa WHERE untuk mempersempit kueri Anda.
Total jumlah cookie unik dan frekuensi rata-rata menurut negara bagian
Contoh ini menggabungkan tabel cm_dt_impressions
dan tabel metadata cm_dt_state
untuk menampilkan total tayangan iklan, jumlah cookie per negara bagian, dan rata-rata tayangan iklan menurut pengguna, yang dikelompokkan menurut negara bagian atau provinsi geografis Amerika Utara.
WITH impression_stats AS (
SELECT
event.country_domain_name AS country,
CONCAT(event.country_domain_name, '-', event.state) AS state,
COUNT(DISTINCT user_id) AS users,
COUNT(*) AS impressions
FROM adh.cm_dt_impressions
WHERE event.country_domain_name = 'US'
OR event.country_domain_name = 'CA'
GROUP BY 1, 2
)
SELECT
country,
IFNULL(state_name, state) AS state_name,
users,
impressions,
FORMAT(
'%0.2f',
IF(
IFNULL(impressions, 0) = 0,
0,
impressions / users
)
) AS avg_imps_per_user
FROM impression_stats
LEFT JOIN adh.cm_dt_state USING (state)
;
Audiens Display & Video 360
Contoh ini menunjukkan cara menganalisis audiens Display & Video 360. Pelajari audiens mana yang dijangkau tayangan iklan, dan tentukan apakah beberapa audiens berperforma lebih baik daripada yang lain. Pengetahuan ini dapat membantu menyeimbangkan jumlah cookie unik (menempatkan iklan kepada banyak pengguna) dan kualitas (penargetan terbatas dan tayangan iklan terlihat), bergantung pada sasaran Anda.
/* For this query to run, @advertiser_ids and @campaigns_ids and @placement_ids
must be replaced with actual IDs. For example [12345] */
WITH filtered_impressions AS (
SELECT
event.event_time as date,
CASE
WHEN (event.browser_enum IN ('29', '30', '31')
OR event.os_id IN
(501012, 501013, 501017, 501018,
501019, 501020, 501021, 501022,
501023, 501024, 501025, 501027))
THEN 'Mobile'
ELSE 'Desktop'
END AS device,
event.dv360_matching_targeted_segments,
event.active_view_viewable_impressions,
event.active_view_measurable_impressions,
user_id
FROM adh.cm_dt_impressions
WHERE event.dv360_matching_targeted_segments != ''
AND event.advertiser_id in UNNEST(@advertiser_ids)
AND event.campaign_id IN UNNEST(@campaign_ids)
AND event.dv360_country_code = 'US'
)
SELECT
audience_id,
device,
COUNT(*) AS impressions,
COUNT(DISTINCT user_id) AS uniques,
ROUND(COUNT(*) / COUNT(DISTINCT user_id), 1) AS frequency,
SUM(active_view_viewable_impressions) AS viewable_impressions,
SUM(active_view_measurable_impressions) AS measurable_impressions
FROM filtered_impressions
JOIN UNNEST(SPLIT(dv360_matching_targeted_segments, ' ')) AS audience_id
GROUP BY 1, 2
;
Visibilitas
Contoh ini menunjukkan cara mengukur metrik visibilitas Tampilan Aktif Plus.
WITH T AS (
SELECT cm_dt_impressions.event.impression_id AS Impression,
cm_dt_impressions.event.active_view_measurable_impressions AS AV_Measurable,
SUM(cm_dt_active_view_plus.event.active_view_plus_measurable_count) AS AVP_Measurable
FROM adh.cm_dt_impressions
FULL JOIN adh.cm_dt_active_view_plus
ON (cm_dt_impressions.event.impression_id =
cm_dt_active_view_plus.event.impression_id)
GROUP BY Impression, AV_Measurable
)
SELECT COUNT(Impression), SUM(AV_Measurable), SUM(AVP_Measurable)
FROM T
;
WITH Raw AS (
SELECT
event.ad_id AS Ad_Id,
SUM(event.active_view_plus_measurable_count) AS avp_total,
SUM(event.active_view_first_quartile_viewable_impressions) AS avp_1st_quartile,
SUM(event.active_view_midpoint_viewable_impressions) AS avp_2nd_quartile,
SUM(event.active_view_third_quartile_viewable_impressions) AS avp_3rd_quartile,
SUM(event.active_view_complete_viewable_impressions) AS avp_complete
FROM
adh.cm_dt_active_view_plus
GROUP BY
1
)
SELECT
Ad_Id,
avp_1st_quartile / avp_total AS Viewable_Rate_1st_Quartile,
avp_2nd_quartile / avp_total AS Viewable_Rate_2nd_Quartile,
avp_3rd_quartile / avp_total AS Viewable_Rate_3rd_Quartile,
avp_complete / avp_total AS Viewable_Rate_Completion_Quartile
FROM
Raw
WHERE
avp_total > 0
ORDER BY
Viewable_Rate_1st_Quartile DESC
;
Data dinamis di Transfer Data Campaign Manager 360
Jumlah tayangan per profil dan feed dinamis
SELECT
event.dynamic_profile,
feed_name,
COUNT(*) as impressions
FROM adh.cm_dt_impressions
JOIN UNNEST (event.feed) as feed_name
GROUP BY 1, 2;
Jumlah tayangan per label pelaporan dinamis di feed 1
SELECT
event.feed_reporting_label[SAFE_ORDINAL(1)] feed1_reporting_label,,
COUNT(*) as impressions
FROM adh.cm_dt_impressions
WHERE event.feed_reporting_label[SAFE_ORDINAL(1)] <> “” # where you have at least one reporting label set
GROUP BY 1;
Jumlah tayangan yang label pelaporannya = 'merah' dalam feed 2
SELECT
event.feed_reporting_label[SAFE_ORDINAL(2)] AS feed1_reporting_label,
COUNT(*) as impressions
FROM adh.cm_dt_impressions
WHERE event.feed_reporting_label[SAFE_ORDINAL(2)] = “red”
GROUP BY 1;
Jumlah tayangan yang pelaporan dimensi_1 = ‘merah’ dan dimensi pelaporan_2 = ‘mobil’ dalam feed 1
SELECT
event.feed_reporting_label[SAFE_ORDINAL(1)] AS feed1_reporting_label,
event.feed_reporting_dimension1[SAFE_ORDINAL(1)] AS feed1_reporting_dimension1,
event.feed_reporting_dimension2[SAFE_ORDINAL(1)] AS feed2_reporting_dimension1,
event.feed_reporting_dimension3[SAFE_ORDINAL(1)] AS feed3_reporting_dimension1,
event.feed_reporting_dimension4[SAFE_ORDINAL(1)] AS feed4_reporting_dimension1,
event.feed_reporting_dimension5[SAFE_ORDINAL(1)] AS feed5_reporting_dimension1,
event.feed_reporting_dimension6[SAFE_ORDINAL(1)] AS feed6_reporting_dimension1,
COUNT(*) as impressions
FROM adh.cm_dt_impressions
WHERE event.feed_reporting_dimension1[SAFE_ORDINAL(1)] = “red”
AND event.feed_reporting_dimension2[SAFE_ORDINAL(1)] = “car”
GROUP BY 1,2,3,4,5,6,7;
Format Iklan di Transfer Data Campaign Manager 360
Contoh ini menunjukkan cara menentukan format iklan yang memaksimalkan jumlah cookie unik atau frekuensi tayangan. Gunakan pengetahuan ini untuk membantu menyeimbangkan total jumlah cookie unik dan eksposur pengguna terhadap iklan.
Penayangan tayangan iklan
/* For this query to run, @advertiser_ids and @campaigns_ids
must be replaced with actual IDs. For example [12345]. YOUR_BQ_DATASET must be
replaced with the actual name of your dataset.*/
WITH filtered_uniques AS (
SELECT
user_id,
CASE
WHEN creative_type LIKE '%Video%' THEN 'Video'
WHEN creative_type IS NULL THEN 'Unknown'
ELSE 'Display'
END AS creative_format,
COUNT(*) AS impressions
FROM adh.cm_dt_impressions impression
LEFT JOIN YOUR_BQ_DATASET.campaigns creative
ON creative.rendering_id = impression.event.rendering_id
WHERE user_id != '0'
AND event.advertiser_id IN UNNEST(@advertiser_ids)
AND event.campaign_id IN UNNEST(@campaign_ids)
AND event.country_domain_name = 'US'
GROUP BY user_id, creative_format
)
SELECT
impressions AS frequency,
creative_format,
COUNT(DISTINCT user_id) AS uniques,
SUM(impressions) AS impressions
FROM filtered_uniques
GROUP BY frequency, creative_format
ORDER BY frequency
;
Jumlah dan frekuensi cookie unik
/* For this query to run, @advertiser_ids and @campaigns_ids
must be replaced with actual IDs. For example [12345]. YOUR_BQ_DATASET must be
replaced with the actual name of your dataset. */
WITH filtered_impressions AS (
SELECT
event.campaign_id AS campaign_id,
event.rendering_id AS rendering_id,
user_id
FROM adh.cm_dt_impressions
WHERE user_id != '0'
AND event.advertiser_id IN UNNEST(@advertiser_ids)
AND event.campaign_id IN UNNEST(@campaign_ids)
AND event.country_domain_name = 'US'
)
SELECT
Campaign,
CASE
WHEN creative_type LIKE '%Video%' THEN 'Video'
WHEN creative_type IS NULL THEN 'Unknown'
ELSE 'Display'
END AS creative_format,
COUNT(DISTINCT user_id) AS users,
COUNT(*) AS impressions
FROM filtered_impressions
LEFT JOIN YOUR_BQ_DATASET.campaigns USING (campaign_id)
LEFT JOIN YOUR_BQ_DATASET.creatives USING (rendering_id)
GROUP BY 1, 2
;
Google Ads
Tayangan aplikasi seluler dengan tabel _rdid
Kueri 1:
SELECT
campaign_id,
COUNT(*) AS imp,
COUNT(DISTINCT user_id) AS users
FROM adh.google_ads_impressions
WHERE is_app_traffic
GROUP BY 1
;
Kueri 2:
SELECT
campaign_id,
COUNT(DISTINCT device_id_md5) AS device_ids
FROM adh.google_ads_impressions_rdid
GROUP BY 1
;
Hasilnya dapat digabungkan menggunakan campaign_id.
Penyampaian demografi
Contoh ini menunjukkan cara menentukan kampanye mana yang menjangkau demografi tertentu.
/* For this query to run, @customer_id
must be replaced with an actual ID. For example [12345] */
WITH impression_stats AS (
SELECT
campaign_id,
demographics.gender AS gender_id,
demographics.age_group AS age_group_id,
COUNT(DISTINCT user_id) AS users,
COUNT(*) AS impressions
FROM adh.google_ads_impressions
WHERE customer_id = @customer_id
GROUP BY 1, 2, 3
)
SELECT
campaign_name,
gender_name,
age_group_name,
users,
impressions
FROM impression_stats
LEFT JOIN adh.google_ads_campaign USING (campaign_id)
LEFT JOIN adh.gender USING (gender_id)
LEFT JOIN adh.age_group USING (age_group_id)
ORDER BY 1, 2, 3
;
Visibilitas
Untuk ringkasan tentang Visibilitas dengan contoh kueri, lihat Metrik Tampilan Aktif Lanjutan
Setelan zona waktu pengiklan Google Ads
SELECT
customer_id,
customer_timezone,
count(1) as impressions
FROM adh.google_ads_impressions i
INNER JOIN adh.google_ads_customer c
ON c.customer_id = i.customer_id
WHERE TIMESTAMP_MICROS(i.query_id.time_usec) >= CAST(DATETIME(@date, c.customer_timezone) AS TIMESTAMP)
AND TIMESTAMP_MICROS(i.query_id.time_usec) < CAST(DATETIME_ADD(DATETIME(@date, c.customer_timezone), INTERVAL 1 DAY) AS TIMESTAMP)
GROUP BY customer_id, customer_timezone
Jenis inventaris
Contoh kueri ini menunjukkan konsep jenis inventaris. Anda dapat menggunakan
inventory_type
untuk menentukan inventaris tempat iklan ditayangkan, seperti
Gmail atau YouTube Music. Nilai yang mungkin: YOUTUBE
, YOUTUBE_TV
,
YOUTUBE_MUSIC
, SEARCH
, GMAIL
, OTHER
. Lainnya merujuk pada
Jaringan Display atau Video.
SELECT
i.campaign_id,
cmp.campaign_name,
i.inventory_type,
COUNT(i.query_id.time_usec) AS impressions
FROM adh.google_ads_impressions i
LEFT JOIN adh.google_ads_campaign cmp ON (i.campaign_id = cmp.campaign_id)
WHERE
TIMESTAMP_MICROS(i.query_id.time_usec)
BETWEEN @local_start_date
AND TIMESTAMP_ADD(@local_start_date,INTERVAL @number_days*24 HOUR)
GROUP BY 1, 2, 3
ORDER BY 4 DESC
Menggunakan model atribusi
Ads Data Hub mendukung atribusi berbasis data (DDA) dan klik terakhir atribusi (LCA) dalam tabel konversi Google Ads. Sebelum September 19 2023, hanya LCA yang didukung. Contoh berikut menunjukkan cara menemukan konversi yang menggunakan salah satu model tersebut, dan cara menggunakan setelan konversi pada tabel metadata.
Menemukan konversi atribusi berbasis data
Contoh ini menemukan konversi yang menggunakan model DDA:
SELECT
s.name
SUM(conv.num_conversion_micros)/1000000 AS num_convs
FROM adh.google_ads_conversions AS conv
JOIN adh.google_ads_conversion_settings AS s
ON (conv.conversion_type = s.conversion_type_id)
WHERE s.action_optimization = 'Primary'
AND s.attribution_model = 'DATA_DRIVEN'
GROUP BY 1;
Menemukan konversi atribusi klik terakhir
Untuk mempertahankan perilaku lama, tambahkan klausa WHERE
ke kueri untuk memfilter
hasil konversi atribusi klik terakhir:
SELECT COUNT(*)
FROM adh.google_ads_conversions
WHERE conversion_type = 123
AND conversion_attribution_model_type = 'LAST_CLICK';
Menggunakan tabel metadata untuk memfilter menurut nama konversi
Tabel metadata setelan konversi memungkinkan Anda memfilter berdasarkan nama yang bermakna dan bukan angka.
Misalnya, daripada memfilter konversi menurut conversion_type
:
SELECT COUNT(*)
FROM adh.google_ads_conversions
WHERE conversion_type = 291496508;
Gunakan klausa JOIN
, untuk memfilter menggunakan kolom di setelan konversi
tabel metadata :
SELECT SUM(num_conversion_micros)/1000000 AS num_convs
FROM adh.google_ads_conversions AS conv
JOIN adh.google_ads_conversion_settings AS s
ON (conv.conversion_type = s.conversion_type_id)
WHERE s.name = 'LTH Android Order';
SELECT s.name, SUM(conv.num_conversion_micros)/1000000 AS num_convs
FROM adh.google_ads_conversions AS conv
JOIN adh.google_ads_conversion_settings AS s
ON (conv.conversion_type = s.conversion_type_id)
WHERE s.conversion_category = 'PURCHASE'
AND s.action_optimization = 'Primary'
GROUP BY 1;
Kueri pod iklan YouTube
Pod iklan mengelompokkan 2 iklan ke dalam satu jeda iklan selama sesi menonton YouTube yang lebih lama. (Pikirkan jeda komersial, tetapi terbatas pada 2 iklan.) Iklan yang ditayangkan dalam pod iklan tetap dapat dilewati. Namun, jika pengguna melewati iklan pertama, iklan kedua juga akan dilewati.
Tayangan kampanye TrueView Instream dan penayangan TrueView Google Ads
SELECT
cmp.campaign_name,
imp.is_app_traffic,
COUNT(*) AS total_impressions,
COUNTIF(clk.click_id IS NOT NULL) AS total_trueview_views
FROM adh.google_ads_impressions imp
JOIN adh.google_ads_campaign cmp USING (campaign_id)
JOIN adh.google_ads_adgroup adg USING (adgroup_id)
LEFT JOIN adh.google_ads_clicks clk ON
imp.impression_id = clk.impression_id
WHERE
imp.customer_id IN UNNEST(@customer_ids)
AND adg.adgroup_type = 'VIDEO_TRUE_VIEW_IN_STREAM'
AND cmp.advertising_channel_type = 'VIDEO'
GROUP BY 1, 2
Metrik visibilitas Display & Video 360 menurut item baris
WITH
imp_stats AS (
SELECT
imp.line_item_id,
count(*) as total_imp,
SUM(num_active_view_measurable_impression) AS num_measurable_impressions,
SUM(num_active_view_eligible_impression) AS num_enabled_impressions
FROM adh.dv360_youtube_impressions imp
WHERE
imp.line_item_id IN UNNEST(@line_item_ids)
GROUP BY 1
),
av_stats AS (
SELECT
imp.line_item_id,
SUM(num_active_view_viewable_impression) AS num_viewable_impressions
FROM adh.dv360_youtube_impressions imp
LEFT JOIN
adh.dv360_youtube_active_views av
ON imp.impression_id = av.impression_id
WHERE
imp.line_item_id IN UNNEST(@line_item_ids)
GROUP BY 1
)
SELECT
li.line_item_name,
SUM(imp.total_imp) as num_impressions,
SUM(imp.num_measurable_impressions) AS num_measurable_impressions,
SUM(imp.num_enabled_impressions) AS num_enabled_impressions,
SUM(IFNULL(av.num_viewable_impressions, 0)) AS num_viewable_impressions
FROM imp_stats as imp
LEFT JOIN av_stats AS av USING (line_item_id)
JOIN adh.dv360_youtube_lineitem li ON (imp.line_item_id = li.line_item_id)
GROUP BY 1
Kueri YouTube Reserve
Penayangan tayangan iklan oleh pengiklan
Kueri ini mengukur jumlah tayangan dan pengguna unik per pengiklan. Anda dapat menggunakan angka ini untuk menghitung jumlah rata-rata tayangan per pengguna (atau "frekuensi iklan").
SELECT
advertiser_name,
COUNT(*) AS imp,
COUNT(DISTINCT user_id) AS users
FROM adh.yt_reserve_impressions AS impressions
JOIN adh.yt_reserve_order order ON impressions.order_id = order.order_id
GROUP BY 1
;
Pengabaian iklan
Kueri ini mengukur jumlah pengabaian iklan per pelanggan, kampanye, grup iklan, dan materi iklan.
SELECT
impression_data.customer_id,
impression_data.campaign_id,
impression_data.adgroup_id,
impression_data.ad_group_creative_id,
COUNTIF(label = "videoskipped") AS num_skips
FROM
adh.google_ads_conversions
GROUP BY 1, 2, 3, 4;
Kueri umum
Mengurangi satu grup pengguna dari grup pengguna lainnya
Contoh ini menunjukkan cara mengurangi satu kelompok pengguna dari kelompok pengguna yang lain. Teknik ini memiliki beragam penerapan, termasuk menghitung orang yang tidak berkonversi, pengguna tanpa tayangan iklan terlihat, dan pengguna tanpa klik.
WITH exclude AS (
SELECT DISTINCT user_id
FROM adh.google_ads_impressions
WHERE campaign_id = 123
)
SELECT
COUNT(DISTINCT imp.user_id) -
COUNT(DISTINCT exclude.user_id) AS users
FROM adh.google_ads_impressions imp
LEFT JOIN exclude
USING (user_id)
WHERE imp.campaign_id = 876
;
Tumpang-tindih kustom
Kueri ini mengukur tumpang-tindih dari 2 kampanye atau lebih. Data ini dapat disesuaikan untuk mengukur tumpang-tindih berdasarkan kriteria diskresi.
/* For this query to run, @campaign_1 and @campaign_2 must be replaced with
actual campaign IDs. */
WITH flagged_impressions AS (
SELECT
user_ID,
SUM(IF(campaign_ID in UNNEST(@campaign_1), 1, 0)) AS C1_impressions,
SUM(IF(campaign_ID in UNNEST(@campaign_2), 1, 0)) AS C2_impressions
FROM adh.cm_dt_impressions
GROUP BY user_ID
SELECT COUNTIF(C1_impressions > 0) as C1_cookie_count,
COUNTIF(C2_impressions > 0) as C2_cookie_count,
COUNTIF(C1_impressions > 0 and C2_impressions > 0) as overlap_cookie_count
FROM flagged_impressions
;
Dijual oleh Partner - Jual Silang
Kueri ini mengukur tayangan dan klik-tayang inventaris yang dijual oleh partner.
SELECT
a.record_date AS record_date,
a.line_item_id AS line_item_id,
a.creative_id AS creative_id,
a.ad_id AS ad_id,
a.impressions AS impressions,
a.click_through AS click_through,
a.video_skipped AS video_skipped,
b.pixel_url AS pixel_url
FROM
(
SELECT
FORMAT_TIMESTAMP('%D', TIMESTAMP_MICROS(i.query_id.time_usec), 'Etc/UTC') AS record_date,
i.line_item_id as line_item_id,
i.creative_id as creative_id,
i.ad_id as ad_id,
COUNT(i.query_id) as impressions,
COUNTIF(c.label='video_click_to_advertiser_site') AS click_through,
COUNTIF(c.label='videoskipped') AS video_skipped
FROM
adh.partner_sold_cross_sell_impressions AS i
LEFT JOIN adh.partner_sold_cross_sell_conversions AS c
ON i.impression_id = c.impression_id
GROUP BY
1, 2, 3, 4
) AS a
JOIN adh.partner_sold_cross_sell_creative_pixels AS b
ON (a.ad_id = b.ad_id)
;
Tayangan app store
Kueri berikut menghitung jumlah total tayangan yang dikelompokkan menurut app store dan aplikasi.
SELECT app_store_name, app_name, COUNT(*) AS number
FROM adh.google_ads_impressions AS imp
JOIN adh.mobile_app_info
USING (app_store_id, app_id)
WHERE imp.app_id IS NOT NULL
GROUP BY 1,2
ORDER BY 3 DESC