CODEWITHSUNDEEP
mysqlgroup-concat
firoz
firoz

Reputation: 91

MySQL's Group_Concat function miss the nulls. How can group the rows including NULLs.

Consider the following example of Table1 

usrID orderID deliverID
1     303     102
1     304     103
2     305     NULL
2     306     105
3     307     NULL
3     308     NULL

I want to concat the orderID, deliverID and group as usrID, as following

usrID orderID_group deliverID_group
1     303,304       102,103
2     305,306       NULL,105
3     307,308       NULL,NULL

I am using the following MySQL query which miss the NULL value. 

SELECT usrID,
       GROUP_CONCAT(orderID SEPARATOR “,” ) AS orderID_group,
       GROUP_CONCAT(deliverID SEPARATOR “,”) AS deliverID_group
FROM   table1
GROUP  BY usrID;

I want to include both NOT NULL and NULL in sequence order. I would appreciate if anyone kindly write the MySQL query. Thanks

Upvotes: 1

Views: 183

Answers (1)

juergen d
juergen d

Reputation: 204746

Try

SELECT usrID, 
       GROUP_CONCAT(case when orderID is null then 'null' else orderID end order by orderID) AS orderID_group, 
       GROUP_CONCAT(case when deliverID is null then 'null' else deliverID end order by orderID) AS deliverID_group 
FROM table1 
GROUP BY usrID;

Upvotes: 2

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