grouping

问题 I would like a third column "items" with the values that are grouped. var dic = new Dictionary<string, int>(); dic.Add("a", 1); dic.Add("b", 1); dic.Add("c", 2); dic.Add("d", 3); var dCounts = (from i in dic group i by i.Value into g select new { g.Key, count = g.Count()}); var a = dCounts.Where(c => c.count>1 ); dCounts.Dump(); a.Dump(); This code results in: Key Count 1 2 2 1 3 1 I would like these results: Key Count Items 1 2 a, b 2 1 c 3 1 d 回答1: var dCounts = (from i in dic group i by i

问题 I have the following data: pd.DataFrame({'Group_ID':[1,1,1,2,2,2,3,4,5,5], 'Item_id':[1,2,3,4,5,6,7,8,9,10], 'Target': [0,0,1,0,1,1,0,0,0,1]}) Group_ID Item_id Target 0 1 1 0 1 1 2 0 2 1 3 1 3 2 4 0 4 2 5 1 5 2 6 1 6 3 7 0 7 4 8 0 8 5 9 0 9 5 10 1 I need to split the dataset into a training and testing set based on the "Group_ID" so that 80% of the data goes into a training set and 20% into a test set. That is, I need my training set to look something like: Group_ID Item_id Target 0 1 1 0 1 1

问题 I have recently learned about GROUPING SETS, CUBE and ROLLUP for defining multiple grouping sets in sql server. What I am asking is under what circumstances do we use these features ? What are the benefits and advantages of using them? SELECT shipperid, YEAR(shippeddate) AS shipyear, COUNT(*) AS numorders FROM Sales.Orders GROUP BY GROUPING SETS ( ( shipperid, YEAR(shippeddate) ), ( shipperid ), ( YEAR(shippeddate) ), ( ) ); SELECT shipperid, YEAR(shippeddate) AS shipyear, COUNT(*) AS

问题 I have recently learned about GROUPING SETS, CUBE and ROLLUP for defining multiple grouping sets in sql server. What I am asking is under what circumstances do we use these features ? What are the benefits and advantages of using them? SELECT shipperid, YEAR(shippeddate) AS shipyear, COUNT(*) AS numorders FROM Sales.Orders GROUP BY GROUPING SETS ( ( shipperid, YEAR(shippeddate) ), ( shipperid ), ( YEAR(shippeddate) ), ( ) ); SELECT shipperid, YEAR(shippeddate) AS shipyear, COUNT(*) AS

问题 I have recently learned about GROUPING SETS, CUBE and ROLLUP for defining multiple grouping sets in sql server. What I am asking is under what circumstances do we use these features ? What are the benefits and advantages of using them? SELECT shipperid, YEAR(shippeddate) AS shipyear, COUNT(*) AS numorders FROM Sales.Orders GROUP BY GROUPING SETS ( ( shipperid, YEAR(shippeddate) ), ( shipperid ), ( YEAR(shippeddate) ), ( ) ); SELECT shipperid, YEAR(shippeddate) AS shipyear, COUNT(*) AS

问题 I am trying to loop by grouping data with dynamic group parameter. We can use dynamic queries on WHERE conditions on loops but I do not know whether it is possible to use a dynamic string in group condition. Here is the sample where user decides by which field to group and then put additional logic based on the decision: DATA query TYPE string. IF i_condition_type = 'ERNAM'. query = |ERNAM = MARA-ERNAM|. ELSE. query = |ERSDA = MARA-ERSDA|. ENDIF. LOOP AT lt_mara INTO DATA(mara) GROUP BY (

问题 I am trying to loop by grouping data with dynamic group parameter. We can use dynamic queries on WHERE conditions on loops but I do not know whether it is possible to use a dynamic string in group condition. Here is the sample where user decides by which field to group and then put additional logic based on the decision: DATA query TYPE string. IF i_condition_type = 'ERNAM'. query = |ERNAM = MARA-ERNAM|. ELSE. query = |ERSDA = MARA-ERSDA|. ENDIF. LOOP AT lt_mara INTO DATA(mara) GROUP BY (

问题 I am trying to create a power bi replicating the tableau report. In tableau, it automatically group the values when we place the columns in rows pane. But in Power BI, I am not able to group the exact same way of tableau report. Please help me how to group the values in report pane of power bi. I have tried table and matrix visualization but I am not getting the same view like tableau Need to create the same visuals like tableau report. Attached images 回答1: As mentioned in this post, there is

问题 I am trying to create a power bi replicating the tableau report. In tableau, it automatically group the values when we place the columns in rows pane. But in Power BI, I am not able to group the exact same way of tableau report. Please help me how to group the values in report pane of power bi. I have tried table and matrix visualization but I am not getting the same view like tableau Need to create the same visuals like tableau report. Attached images 回答1: As mentioned in this post, there is

问题 I have a JSON of IoT readings as follow: [ { "datetime": "2020-06-29T23:59:59.000Z", "Benzene": 1.9 }, { "datetime": "2020-06-30T00:59:59.000Z", "Benzene": 0.6 }, { "datetime": "2020-06-30T01:59:59.000Z", "Benzene": 5.7 }, { "datetime": "2020-06-30T02:59:59.000Z", "Benzene": 5.5 }, { "datetime": "2020-06-30T03:59:59.000Z", "Benzene": 5.2 }, { "datetime": "2020-06-30T04:59:59.000Z", "Benzene": 1 }, { "datetime": "2020-06-30T05:59:59.000Z", "Benzene": 2.1 }, { "datetime": "2020-06-30T06:59:59