group-concat

I have a Table member with member_id , member_name , club_name , region , zone , email as fields. I am using the MySQL group_concat function like SELECT group_concat(distinct m.email SEPARATOR ', ' ) from member m group by m.club_name This is working fine. But I would like to be able to group_concat on other fields without creating additional queries. Is it possible to supply the other fields as parameter? member_id member_name club_name region zone email 1 member1 A 1 1 email1@example.com 2 member2 A 1 1 email2@example.com 3 member3 B 1 1 email3@example.com 4 member4 C 1 2 email4@example.com

I have the following query which I want to use with ActiveRecord so that it can be translated in native ORACLE based query on production server. Right now I am using SQLITe. select c.name,co.code,GROUP_CONCAT(c.name) AS GroupedName from countries c INNER JOIN continents co on c.continent_code = co.code INNER JOIN event_locations el on el.location_id = c.id group by co.code As long as I know, there's no group_concat equivalent in Rails, but you can use includes to do that: continents = Continents .joins(:countries, :event_locations) .includes(:countries) .group("continents.code") continents

I have a many-to-many relationship between People and Departments since one person can be in many departments. People Departments ------ ----------- pID pName deptID deptName 1 James 1 Engineering 2 Mary 2 Research 3 Paul 3 Marketing 4 Communications People_Departments ------------------ pID deptID 1 1 1 2 2 2 2 4 3 1 3 2 3 3 What I want is this: pName deptName James Engineering, Research Mary Research, Communication Paul Engineering, Research, Marketing If I do plain LEFT JOINs on the tables using the SQL below, I will get several rows related to one person: SELECT people.pName, departments

I have a table to entities (lets call them people) and properties (one person can have an arbitrary number of properties). Ex: People Name Age -------- Jane 27 Joe 36 Jim 16 Properties Name Property ----------------- Jane Smart Jane Funny Jane Good-looking Joe Smart Joe Workaholic Jim Funny Jim Young I would like to write an efficient select that would select people based on age and return all or some of their properties. Ex: People older than 26 Name Properties Jane Smart, Funny, Good-looking Joe Smart, Workaholic It's also acceptable to return one of the properties and total property count.

I have a query where I am using GROUP_CONCAT and a custom separator as my results may contain commas: '----' This all works well, however it is still comma separated, so my output is: Result A----,Result B----,Result C---- How can I make it so the output is: Result A----Result B----Result C---- I thought this was the idea of a custom separator! Failing that, can you escape commas in your results, so I can explode in PHP by the GROUP_CONCAT commas? Looks like you're missing the SEPARATOR keyword in the GROUP_CONCAT function. GROUP_CONCAT(artists.artistname SEPARATOR '----') The way you've