Query for element of array in JSON column

sql json postgresql postgresql-9.3 lateral

Joe · Oct 24, 2013 · Viewed 25k times · Source

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)"?

Answer

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.

Query for element of array in JSON column

Answer

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