problem description I try to read the following json into a Map < String, List < String > >, map value whose key is condName,map is condValue now convert List < Condition > to Map < String, List < Condition > > by combining stream with Collect...
assume that the original data id type time 1 1 201X-XX-XX XX:XX 21 201X-XX-XX XX:XX 3 1 201X-XX-XX XX:XX 4 2 201X-XX-XX XX:XX 52 201X-XX-XX XX:XX query statement Select t.typepart. TimeMAX (t.id), t.* FROM t WHERE t.time between 2018-08-01 ...
Ladies and Gentlemen, I would like to ask you a Pandas grouping question, which I feel is more complicated. df = pd.DataFrame({"Date":pd.date_range(start= 2018-08-17 08:10:30 ,periods=15,freq= s ,normalize=True),"Category":list(...
I have also seen some posts on the Internet, but there are still some problems in the actual operation. Please take a look at what the problem is. demand is the latest record (add_time) of each item (goods_id) in the query tp_inventory_ log table; the...
there are three fields (: score (score) and userid,subject (discipline) in the data table tbscore. The effect I want to achieve is: select sum(score),subject from (select score,subject from tbscore where userid in(1,2,3)) group by subject that is, you...