CREATE TABLE events( 
  id int auto_increment primary key, 
  event_name varchar(255), 
  visitor varchar(255), 
  properties json, 
  browser json
);

INSERT INTO events(event_name, visitor,properties, browser) 
VALUES (
  'pageview', 
   '1',
   '{ "page": "/" }',
   '{ "name": "Safari", "os": "Mac", "resolution": { "x": 1920, "y": 1080 } }'
),
('pageview', 
  '2',
  '{ "page": "/contact" }',
  '{ "name": "Firefox", "os": "Windows", "resolution": { "x": 2560, "y": 1600 } }'
),
(
  'pageview', 
  '1',
  '{ "page": "/products" }',
  '{ "name": "Safari", "os": "Mac", "resolution": { "x": 1920, "y": 1080 } }'
),
(
  'purchase', 
   '3',
  '{ "amount": 200 }',
  '{ "name": "Firefox", "os": "Windows", "resolution": { "x": 1600, "y": 900 } }'
),
(
  'purchase', 
   '4',
  '{ "amount": 150 }',
  '{ "name": "Firefox", "os": "Windows", "resolution": { "x": 1280, "y": 800 } }'
),
(
  'purchase', 
  '4',
  '{ "amount": 500 }',
  '{ "name": "Chrome", "os": "Windows", "resolution": { "x": 1680, "y": 1050 } }'
);

SELECT id, browser->'$.name' browser
FROM events;

+----+-----------+
| id | browser   |
+----+-----------+
|  1 | "Safari"  |
|  2 | "Firefox" |
|  3 | "Safari"  |
|  4 | "Firefox" |
|  5 | "Firefox" |
|  6 | "Chrome"  |
+----+-----------+
6 rows in set (0.00 sec)

SELECT browser->>'$.name' browser, 
      count(browser)
FROM events
GROUP BY browser->>'$.name';

+---------+----------------+
| browser | count(browser) |
+---------+----------------+
| Safari  |              2 |
| Firefox |              3 |
| Chrome  |              1 |
+---------+----------------+
3 rows in set (0.02 sec)

SELECT visitor, SUM(properties->>'$.amount') revenue
FROM events
WHERE properties->>'$.amount' > 0
GROUP BY visitor;

---------+---------+
| visitor | revenue |
+---------+---------+
| 3       |     200 |
| 4       |     650 |
+---------+---------+
2 rows in set (0.00 sec)