Top "Aggregate" questions

Summarizing multiple columns with dplyr?

I'm struggling a bit with the dplyr-syntax. I have a data frame with different variables and one grouping variable. Now …

r dplyr aggregate

Sql Server : How to use an aggregate function like MAX in a WHERE clause

I want get the maximum value for this record. Please help me: SELECT rest.field1 FROM mastertable AS m INNER …

sql sql-server sql-server-2005 tsql aggregate

Aggregate / summarize multiple variables per group (e.g. sum, mean)

From a data frame, is there a easy way to aggregate (sum, mean, max et c) multiple variables simultaneously? Below …

r dataframe data.table aggregate r-faq

data.frame Group By column

I have a data frame DF. Say DF is: A B 1 1 2 2 1 3 3 2 3 4 3 5 5 3 6 Now I want to combine together the rows by …

r aggregate

Pandas sum by groupby, but exclude certain columns

What is the best way to do a groupby on a Pandas dataframe, but exclude some columns from that groupby? …

python pandas group-by aggregate

What are Aggregates and PODs and how/why are they special?

This FAQ is about Aggregates and PODs and covers the following material: What are Aggregates? What are PODs (Plain Old …

c++ c++11 aggregate c++17 standard-layout

ListAGG in SQLSERVER

I'm trying to aggregate a 'STRING' field in SQLServer. I would like to find the same function LISTAGG like in …

sql sql-server aggregate

SELECT list is not in GROUP BY clause and contains nonaggregated column

Receiving the following error: Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'world.country.…

mysql sql aggregate mysql-error-1055

Aggregate multiple columns at once

I have a data-frame likeso: x <- id1 id2 val1 val2 val3 val4 1 a x 1 9 2 a x 2 4 3 a y 3 5 4 …

r aggregate

Extract the maximum value within each group in a dataframe

I have a data frame with a grouping variable ("Gene") and a value variable ("Value"): Gene Value A 12 A 10 B 3 …

r aggregate