SELECT one column, with multiple columns returned where other columns are same, mysql query

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SELECT one column (val3), with multiple columns returned where other columns (id, val1) are same, mysql query

data looks something like that

id val1 val2 val3
R  m    1    a   
N  c    1    c
N  c    2    d
Y  b    1    e
Y  h    1    u
Y  h    2    i

the result should be

id val1 val3s
R  m    a   
N  c    c,d
Y  b    e
Y  h    u,i

What I have tried:

Have done,

SELECT id, val1,  
CASE
 WHEN COUNT(val1) = 1 THEN  CONCAT('(', val3, ')')
 WHEN COUNT(val1) > 1 THEN  CONCAT('(',  '??' , ')')
END AS val3s
FROM table1
GROUP BY val1

Posted 5-Sep-16 23:55pm

learz

Updated 6-Sep-16 2:44am

v4

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2 solutions

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manu_dhobale · Answer 1 · 2016-09-06T01:01:00

Solution 1

Please try this. Hope this will help, here your table1 is TestConC

select  a.id, a.val1, CustomData
= STUFF( (SELECT ',' + b.val3 
                             FROM TestConC b    
                             where b.id=a.id and b.val1=a.val1                     
                             FOR XML PATH('')),1, 1, '')
From TestConC a
group by  a.id, a.val1
order by a.id

Posted 6-Sep-16 1:01am

manu_dhobale

Comments

Rajesh waran 6-Sep-16 7:19am

5+

manu_dhobale 6-Sep-16 7:21am

Thanks

Maciej Los 6-Sep-16 7:48am

Seems that OP wants to display only non-numeric data. Your solution is not adequate.

Richard Deeming 6-Sep-16 8:38am

That's the solution for Microsoft SQL Server. The question is tagged as MySQL.

Richard Deeming · Answer 2 · 2016-09-06T02:44:00

Solution 2

Sounds like you're looking for the GROUP_CONCAT function[^]:

SQL

SELECT
    id,
    val1,
    GROUP_CONCAT(val3) As val3s
FROM
    table1
GROUP BY
    id,
    val1
;

Posted 6-Sep-16 2:44am

Richard Deeming