Hi everyone, I am working on Google Ads API. My goal is to find detailed
information on the cost, clicks, etc. for each "Performance Max" campaign.
When I use the following query:
```
SELECT
campaign.id,
campaign.name,
segments.ad_network_type,
segments.advertising_channel_type
FROM
campaign
WHERE
segments.date DURING LAST_30_DAYS
AND segments.advertising_channel_type = 'Performance Max'
```
I see that the ad_network_type field has a value of 'mixed'. I want to find
detailed information on what constitutes this 'mixed' value (e.g., how many
clicks, impressions, cost) for the components such as:
CONTENT
GOOGLE_TV
SEARCH
SEARCH_PARTNERS
UNKNOWN
UNSPECIFIED
YOUTUBE
I found information in the documentation that such data can be retrieved
from the detail_placement_view table:
https://developers.google.com/google-ads/api/fields/v15/detail_placement_view
https://developers.google.com/google-ads/api/fields/v15/detail_placement_view_query_builder
However, when I try to retrieve any data from this table, even with the
simplest query, I always get an empty array as a result, for example:
I have tried this query:
```
SELECT detail_placement_view.placement_type
FROM detail_placement_view
WHERE segments.date BETWEEN '2024-01-01' AND '2024-05-26'
```
and it always returns me an emtpy array. I have tried manipulating this
query, extracting different fields, increasing the date range, etc., but I
always get an empty array. Why is this happening? Is this table still
provided by Google, or is it deprecated? Does anyone have any information
on this?
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