How to group mysql rows with same column value into one row?

Question

I have two tables, keywords and data.

Table keywords have 2 columns (id, keyword), table data have 3 columns (id[foreign key of keywords.id], name, value).

I am using this query:

SELECT k.id, d.value, d.name FROM keywords AS k INNER JOIN data as d ON k.id = d.id 

it returns something like:

1 123 name1 1 456 name2 2 943 name1 3 542 name1 3 532 name2 3 682 name3 

Each id can have values from 0 to 3 (maybe more in the future).

How can I retrieve all the rows with the same id in the same row?

Like

1 123 456 2 943 3 542 532 682 

I want to do this because I want to be able to sort the values.

Answer 1

Use GROUP_CONCAT() like this:

 SELECT k.id, GROUP_CONCAT(d.value)   FROM keywords AS k   INNER JOIN data as d ON k.id = d.id   GROUP BY k.id 

Also, you may need to do ORDER BY d.name to get exact order of values as you want. Like this:

 SELECT k.id, GROUP_CONCAT(d.value ORDER BY d.name separator ' ')   FROM keywords AS k   INNER JOIN data as d ON k.id = d.id   GROUP BY k.id