group-by

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Get index from a list where the key changes, groupby

I have a list that looks like this: myList = [1, 1, 1, 1, 2, 2, 2, 3, 3, 3] What I want to do is record the index where the items in the list changes value. So for my list above it would be 3, 6.[详细]

2023-04-09 11:35 分类：问答
COUNT(DISTINCT X) MySQL Query doesn't give results I need

In MySQL I have a query to count all of the browsers from a page_views table that I want to aggregate. Here\'s my query:[详细]

2023-04-09 08:19 分类：问答
sqlalchemy joined alias doesn't have columns from both tables

All I want is the count from TableA grouped by a column from TableB, but of course开发者_如何学Python I need the item from TableB each count is associated with.Better explained with code:[详细]

2023-04-09 03:32 分类：问答
Group by an array's element in PostgreSQL

In Postgres 8.3, I need to group by certain elements with开发者_开发知识库in an array field. When I group by the array itself, all possible combinations are shown. I only want to group by the element.[详细]

2023-04-08 21:44 分类：问答
Linq query for grouping [closed]

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetoric开发者_Python百科al andcannot be reasonably answered in its current for[详细]

2023-04-08 21:05 分类：问答
SQL : How can I use sub query in a query with group by section?

How can I use sub query in a query with group by section? I use SQL Server 2008 R2 AND Delphi 2010 I receive this error:[详细]

2023-04-08 19:49 分类：问答
How do I remove duplicate entries in this T-SQL query containing LEFT OUTER JOIN

I am having issues taking out duplicate entries from this query containing multiple LEFT OUTER JOINs SELECT s.Category,[详细]

2023-04-08 18:44 分类：问答
Ordering records by frequency with Arel

How do I retrieve a set of records, ordered by count in Arel? I have a model which tracks how many views a product get. I want to find the X most frequently viewed products over the last Y days.[详细]

2023-04-08 17:29 分类：问答
Mysql COUNT, GROUP BY and ORDER BY

This sounds quite simple but I just can\'t figure it out. I have a table orders (id, username, telephone_number).[详细]

2023-04-08 16:06 分类：问答
Is there a way to GROUP BY a time interval in this table?

I have a table like this one: DateTimeA 10:00:012 10:00:074 10:00:102 10:00:171 10:00:183 Is this possible to create a que开发者_如何学Pythonry that returns me the average value of A each 10 seco[详细]

2023-04-08 07:44 分类：问答