MySQL - How Can I Automate a View Query That Subtracts Metrics From the Most Recent Date To The Previous Day & Date Stamps The Most Recent Data

问题

I have a daily API call that gives me LIFETIME data for a unique ID and date stamps the data batch every day at midnight. This data is appended to a database in MySQL, but I need to transform it in a way where I can get daily data for that unique id for every metric.

My Table in MySQL:

Desired Output:

For id 3 I took the previous day (7/3/2017) and most recent date (7/4/2017) difference for it's respective metrics (Impressions, Clicks) and time stamped that line item as 7/4/2017. I need to process this type of transformation by id for multiple ids and metrics. Thank you!

UPDATE of My Query Based on Jacob's Feedback:

CREATE VIEW `facebook_insights` AS  
SELECT  
  t1.id  
, t1.timestamp  
, t1.message  
, t1.posted  
, t1.permalink_url  
, t1.caption  
, t1.link  
, t1.type  
, t1.post_impressions - t2.post_impressions as Impressions  
, t1.post_impressions_organic - t2.post_impressions_organic as Post_Impressions_Organic  
, t1.post_impressions_paid - t2.post_impressions_paid as Post_Impressions_Paid  
, t1.post_engaged_users - t2.post_engaged_users as Post_Engaged_Users  
, t1.post_consumptions - t2.post_consumptions as Post_Consumptions  
, t1.post_negative_feedback - t2.post_negative_feedback as 
Post_Negative_Feedback  
, t1.post_negative_feedback_unique - t2.Post_Negative_Feedback_Unique as 
Post_Negative_Feedback_Unique  
, t1.post_impressions_fan - t2.post_impressions_fan as Post_Impressions_Fan  
, t1.post_impressions_fan_paid - t2.post_impressions_fan_paid as 
Post_Impressions_Fan_Paid  
, t1.post_engaged_fan - t2.Post_Engaged_Fan as Post_Engaged_Fan  
, t1.post_video_complete_views_organic - 
t2.post_video_complete_views_organic as Post_Video_Complete_Views_Organic  
, t1.post_video_complete_views_paid - t2.post_video_complete_views_paid as 
Post_Video_Complete_Views_Paid  
, t1.post_video_views_10s - t2.post_video_views_10s as Post_Video_Views_10s  
, t1.post_video_views_10s_unique - t2.post_video_views_10s_unique as 
Post_Video_Views_10s_Unique  
, t1.post_video_views_organic - t2.post_video_views_organic as 
Post_Video_Views_Organic  
, t1.post_video_views_paid - t2.post_video_views_paid as 
Post_Video_Views_Paid  
, t1.post_video_views_clicked_to_play - t2.post_video_views_clicked_to_play 
as Post_Video_Views_Clicked_to_Play  

FROM  
unpaid_media.facebook_insight t1  
JOIN unpaid_media.facebook_insight t2  
ON t1.id = t2.id   
and t1.timestamp  = t2.timestamp + INTERVAL 1 DAY

回答1:

The key here is to rejoin the table to itself. In the query below, I'm rejoining your table, but setting it up so that the timestamp is a qualifier on the join. This will join the previous day's records and allow you to simply subtract them.

select
  t1.id
  , t1.timestamp
  , t1.impressions - t2.impressions as impressions
  , t1.clicks - t2.clicks as clicks
from
  table t1
  join table t2
    on t1.id         = t2.id
    and t1.timestamp = t2.timestamp + INTERVAL 1 DAY

回答2:

It looks like a grouping function can be useful as it looks like you want to aggregate the impressions and clicks by date and ID. Also, you didnt mention this data required any joins (yet), so this is assuming it's in a single table. Below in T-SQL:

USE DatabaseName
GO

SELECT T.ID, 
       (CAST(T.TimeStamp) as Date) as Date, 
       SUM(T.Impressions) as TotalImpressionsPerDay, 
       SUM(T.Clicks) as TotalClicksPerDay
FROM TableName as T
GROUP BY ID, (CAST(T.TimeStamp) as Date)
ORDER BY ID ASC

来源：https://stackoverflow.com/questions/44936232/mysql-how-can-i-automate-a-view-query-that-subtracts-metrics-from-the-most-rec

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