I am having data like this
1 A
1 B
1 C
1 D
2 E
2 F
3 G
3 H
3 I
3 J
3 K
by using this query
select ABSTRACTS_ITEM._id,Name
from ABSTRACTS_ITEM , ABSTRACT_AUTHOR , AUTHORS_ABSTRACT
where
ABSTRACTS_ITEM._id = AUTHORS_ABSTRACT.ABSTRACTSITEM_ID
and
ABSTRACT_AUTHOR._id = AUTHORS_ABSTRACT.ABSTRACTAUTHOR_ID
Now, I want to show data like this
1 A,B,C,D
2 EF
and so on..I also know it can achieve by GROUP_CONCAT
function. So, I tried with this
SELECT ABSTRACTS_ITEM._id,
GROUP_CONCAT(ABSTRACT_AUTHOR.NAME) FROM
(select ABSTRACTS_ITEM._id,
Name
from
ABSTRACTS_ITEM , ABSTRACT_AUTHOR , AUTHORS_ABSTRACT
where
ABSTRACTS_ITEM._id = AUTHORS_ABSTRACT.ABSTRACTSITEM_ID
and
ABSTRACT_AUTHOR._id = AUTHORS_ABSTRACT.ABSTRACTAUTHOR_ID)
But, It shows me error. So, what I am doing wrong here. What are the right procedure to achieve that?
You need to add GROUP BY
clause when you are using aggregate function. Also use JOIN
to join tables.
So try this:
SELECT AI._id, GROUP_CONCAT(Name) AS GroupedName
FROM ABSTRACTS_ITEM AI
JOIN AUTHORS_ABSTRACT AAB ON AI.ID = AAB.ABSTRACTSITEM_ID
JOIN ABSTRACT_AUTHOR AAU ON AAU._id = AAB.ABSTRACTAUTHOR_ID
GROUP BY tbl._id;
What you were trying was almost correct. You just needed to add GROUP BY
clause at the end. But the first one is better.
SELECT ID,
GROUP_CONCAT(NAME)
FROM
(select ABSTRACTS_ITEM._id AS ID,
Name
from
ABSTRACTS_ITEM , ABSTRACT_AUTHOR , AUTHORS_ABSTRACT
where
ABSTRACTS_ITEM._id = AUTHORS_ABSTRACT.ABSTRACTSITEM_ID
and
ABSTRACT_AUTHOR._id = AUTHORS_ABSTRACT.ABSTRACTAUTHOR_ID)
GROUP BY ID;