StackOverflow2013

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plurals

PO
primarykey
Id
20491635
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-12-10T10:14:52.533
FavoriteCount
0
LastActivityDate
2013-12-10T10:14:52.533
LastEditDate
LastEditorUserId
0
OwnerUserId
524700
ParentId
20470093
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
Try this <pre><code>SELECT DISTINCT @pv := usr.userid, CONCAT( "[", CONVERT( GROUP_CONCAT(DISTINCT "{\"id\":", usr.userid, ", \"subjects\":", ( SELECT CONCAT( "[", CONVERT( GROUP_CONCAT( "{\"id\":", subjectid, ", \"subjectname\":\"", subjectname, "\"}" ) USING utf8 ) , "]" ) FROM subjectdetails WHERE subjectid IN ( SELECT subjectid FROM UserDetails WHERE userid = @pv) ), ", \"username\":\"", usr.username, "\"}" ) USING utf8 ) , "]" ) AS jsn FROM User usr JOIN UserDetails det ON det.userid = usr.userid LEFT OUTER JOIN subjectdetails sub ON sub.subjectid = det.subjectid </code></pre> Output: <pre><code>ID JSN 1 [{"id":1, "subjects":[{"id":1, "subjectname":"basic science"},{"id":2, "subjectname":"advance mathematics"},{"id":4, "subjectname":"geography"}], "username":"robert"},{"id":2, "subjects":[{"id":1, "subjectname":"basic science"},{"id":2, "subjectname":"advance mathematics"},{"id":4, "subjectname":"geography"}], "username":"albert"}] </code></pre> The JSN column having the structure <pre><code>[ { "id": 1, "subjects": [ { "id": 1, "subjectname": "basic science" }, { "id": 2, "subjectname": "advance mathematics" }, { "id": 4, "subjectname": "geography" } ], "username": "robert" }, { "id": 2, "subjects": [ { "id": 1, "subjectname": "basic science" }, { "id": 2, "subjectname": "advance mathematics" }, { "id": 4, "subjectname": "geography" } ], "username": "albert" } ] </code></pre> <a href="http://sqlfiddle.com/#!2/635e4/2" rel="nofollow">SQLFIDDLE</a> Note: The JSON structure in your question is not a valid one. Use <a href="http://pro.jsonlint.com/" rel="nofollow">jsonlint</a> to generate valid json.
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POcreate custom json array from two tables
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USDamodaran
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId
1. This table or related slice is empty.

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