aggregate

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Generating a subquery with Arel to get an average of averages

Lets say I have a few of tables orders = Arel::Table.new :orders stores = Arel::Table.new :stores managers = Arel::Table.new :managers[详细]

2023-02-14 02:39 分类：问答
Using regular expression in R to categorize data

I have a file with two columns, one has the content type of HTTP objects like text/html, application/rar etc and the other has the bytes size.[详细]

2023-02-12 21:47 分类：问答
activerecord custom aggregate

Let\'s consider an image table with columns (id, location_id, created_at, counter_1, counter_2), the following query works fine: and it gives me the most recent picture for each location_id:[详细]

2023-02-12 16:45 分类：问答
How do I aggregate joins?

I have three related tables: Employee(EmployeeId, EmployeeName) Skill(SkillId, SkillName) EmployeeSkill(EmployeSkillId, EmployeeId, SkillId)[详细]

2023-02-12 06:50 分类：问答
How do I implement array::max_size()?

I am building my own array<T, n> class template for fun and education. The C++0x standard draft specifies a member function max_size() 开发者_开发知识库for all containers as distance(begin(), en[详细]

2023-02-12 04:18 分类：问答
SQL Server Group By Bitwise Or? [duplicate]

This question already has answers here: Closed 11 years ago. 开发者_开发问答 Possible Duplicates:[详细]

2023-02-11 15:59 分类：问答
Aggregating quantities across multiple columns without a cursor or temporary table

If I have a table with two columns, A and B, and would like to count how many times an item shows up in both columns, is there a way to do so without using a cursor or temp table?[详细]

2023-02-11 15:51 分类：问答
Union to unsigned long long int cast

I have a union as follows: typedef unsigned long GT_U32; typedef unsigned short GT_U16; typedef unsigned char GT_U8;[详细]

2023-02-11 02:57 分类：问答
Ruby equivalent of C# Linq Aggregate method

Whats the ruby equivalent of Linq Aggregate method. It works something like this var factorial = new[] { 1, 2, 3, 4, 5 }.Aggregate((acc, i) => acc * i);[详细]

2023-02-11 00:36 分类：问答
MySQL: Use aggregate result in further calculation

I\'m currently working on writing report generators.For one report I need to do a breakdown by a given characteristic (supplier, logging user, language, etc which for each row includes the name of the[详细]

2023-02-10 12:22 分类：问答