two fields are aggregated. The first is a normal field user_id, and the second is a date. Date, date needs to be aggregated according to fuzzy aggregation. For example, if the date is 2018-02-15, the data of aggregate user_id,2018-02 is the GROUP BY of ...
I now provide interfaces to the front end. When designing an API, should I try to complete an operation in one API or split it into multiple API? for example, do a function to upload a picture, upload the picture to the file and return it to url, an...
there are multiple items under an order. The order object is stored in the form of nested, and an order is a piece of data. order 1-> Commodity A, Commodity B, Commodity C, Commodity D order 2-> Commodity A, Commodity B, Commodity C, Commodity D. or...