Hi,
I've tried to pull campaign level metrics and i've been successful at it. 
But when making the same request at the ad_group_ad level, metrics come 
back empty, with zeros.
How could this happen? Not all campaigns should have ad attached to them?

campaign level
SELECT
campaign.name,
campaign.status,
metrics.impressions,
metrics.clicks,
metrics.ctr,
metrics.average_cpc,
metrics.cost_micros
FROM campaign

Response:
INFO:google.ads.googleads.client:Request made: ClientCustomerId: 
7429962507, Host: googleads.googleapis.com, Method: 
/google.ads.googleads.v14.services.GoogleAdsService/Search, RequestId: 
UKFOuchDWff3OWUbA6RwMg, IsFault: False, FaultMessage: None 
SearchPager<results { campaign { resource_name: 
"customers/7429962507/campaigns/19899012473" status: ENABLED name: 
"Software Design & Development" } metrics { clicks: 341 cost_micros: 
11079688023 ctr: 0.012521113314239553 average_cpc: 32491753.73313783 
impressions: 27234 } }

when requesting the same but at the ad_group_ad level:
SELECT 
campaign.name,
campaign.status,
ad_group_ad.ad.id, 
ad_group_ad.status,
ad_group_ad.ad.name, 
metrics.clicks, 
metrics.impressions, 
metrics.conversions, 
metrics.video_quartile_p100_rate, 
metrics.video_views, 
metrics.current_model_attributed_conversions, 
metrics.cost_micros 
FROM 
ad_group_ad

i am receiving this:
INFO:google.ads.googleads.client:Request made: ClientCustomerId: 
7429962507, Host: googleads.googleapis.com, Method: 
/google.ads.googleads.v14.services.GoogleAdsService/Search, RequestId: 
djXqZbCFQ2qWsHjsCuoXkw, IsFault: False, FaultMessage: None 
SearchPager<results { campaign { resource_name: 
"customers/7429962507/campaigns/19899012473" status: ENABLED name: 
"Software Design & Development" } metrics { clicks: 0 video_views: 0 
conversions: 0.0 cost_micros: 0 current_model_attributed_conversions: 0.0 
impressions: 0 } ad_group_ad { resource_name: 
"customers/7429962507/adGroupAds/151119724761~652641837331" status: ENABLED 
ad { resource_name: "customers/7429962507/ads/652641837331" id: 
652641837331 } } }

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