MySQL Results as comma separated list

Question

I need to run a query like:

SELECT p.id, p.name, 
       (SELECT name 
          FROM sites s 
         WHERE s.id = p.site_id) AS site_list
  FROM publications p

But I'd like the sub-select to return a comma separated list, instead of a column of data. Is this even possible, and if so, how?

Answer 1

You can use GROUP_CONCAT to perform that, e.g. something like

SELECT p.id, p.name, GROUP_CONCAT(s.name) AS site_list
FROM sites s
INNER JOIN publications p ON(s.id = p.site_id)
GROUP BY p.id, p.name;

Answer 2

Instead of using group concat() you can use just concat()

Select concat(Col1, ',', Col2) as Foo_Bar from Table1;

edit this only works in mySQL; Oracle concat only accepts two arguments. In oracle you can use something like select col1||','||col2||','||col3 as foobar from table1; in sql server you would use + instead of pipes.

Answer 3

In my case i have to concatenate all the account number of a person who's mobile number is unique. So i have used the following query to achieve that.

SELECT GROUP_CONCAT(AccountsNo) as Accounts FROM `tblaccounts` GROUP BY MobileNumber

Query Result is below:

Accounts
93348001,97530801,93348001,97530801
89663501
62630701
6227895144840002
60070021
60070020
60070019
60070018
60070017
60070016
60070015