JSON_EACH

Extracts key-value pairs from a JSON object, breaking down the structure into individual rows in the result set. Each row represents a distinct key-value pair derived from the input JSON expression.

Syntax

JSON_EACH(<json_string>)

Return Type

JSON_EACH returns a set of tuples, each consisting of a STRING key and a corresponding VARIANT value.

Examples

-- Extract key-value pairs from a JSON object representing information about a person
SELECT
  JSON_EACH(
    PARSE_JSON (
      '{"name": "John", "age": 25, "isStudent": false, "grades": [90, 85, 92]}'
    )
  );

┌──────────────────────────────────────────────────────────────────────────────────────────────────┐
│ json_each(parse_json('{"name": "john", "age": 25, "isstudent": false, "grades": [90, 85, 92]}')) │
├──────────────────────────────────────────────────────────────────────────────────────────────────┤
│ ('age','25')                                                                                     │
│ ('grades','[90,85,92]')                                                                          │
│ ('isStudent','false')                                                                            │
│ ('name','"John"')                                                                                │
└──────────────────────────────────────────────────────────────────────────────────────────────────┘

-- Display data types of the extracted values
SELECT
  TYPEOF (
    JSON_EACH(
      PARSE_JSON (
        '{"name": "John", "age": 25, "isStudent": false, "grades": [90, 85, 92]}'
      )
    )
  );

┌──────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ typeof(json_each(parse_json('{"name": "john", "age": 25, "isstudent": false, "grades": [90, 85, 92]}'))) │
├──────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ TUPLE(STRING, VARIANT) NULL                                                                              │
│ TUPLE(STRING, VARIANT) NULL                                                                              │
│ TUPLE(STRING, VARIANT) NULL                                                                              │
│ TUPLE(STRING, VARIANT) NULL                                                                              │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────┘