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3

Recently upgraded to using PostgreSQL 9.3.1 to leverage the JSONfunctionalities. In my table I have a json type column that has a structure like this:

{
   "id": "123",
   "name": "foo",
   "emails":[
      {
        "id": "123",
        "address": "somethinghere"
      },
      {
        "id": "456",
        "address": "soemthing"
      }
   ]
}

This is just dummy data for the purpose of the question.

Is it possible to query for a specific item in the emails array based on the id?
Pretty much: "return email where id=123)"?

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1 Answer 1

up vote 10 down vote accepted

Yes, that's possible:

SELECT *
FROM   tbl t, json_array_elements(t.json_col->'emails') AS elem
WHERE  elem->>'id' = 123;

tbl being your table name, json_col being the name of the JSON column.

More details in these related answers:
How do I query using fields inside the new PostgreSQL JSON datatype?

More about the implicit LATERAL JOIN here (last paragraph):
PostgreSQL unnest() with element number

If you need an index to support this kind of query:
Index For Finding Element in JSON array

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Can you please check my question stackoverflow.com/questions/22527154/… –  Shamith c Mar 20 at 18:28

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