Check out example codes for "mariadb json select". It will help you in understanding the concepts better.

Code Example 1

+----+--------+-------+-------+---------------------------------+
| id | name   | price | stock | attr                            |
+----+--------+-------+-------+---------------------------------+
|  2 | Shirt  | 10.50 |    78 | {"size": 42, "colour": "white"} |
|  3 | Blouse | 17.00 |    15 | {"colour": "white"}             |
+----+--------+-------+-------+---------------------------------+

UPDATE
  Clothes
SET
  attr = JSON_REMOVE(attr, '$.size');
WHERE
	id = 2;
    
+----+--------+-------+-------+---------------------------------+
| id | name   | price | stock | attr                            |
+----+--------+-------+-------+---------------------------------+
|  2 | Shirt  | 10.50 |    78 | {"colour": "white"} 			|
|  3 | Blouse | 17.00 |    15 | {"colour": "white"} 			|
+----+--------+-------+-------+---------------------------------+

Code Example 2

+----+--------+-------+-------+---------------------------------+
| id | name   | price | stock | attr                            |
+----+--------+-------+-------+---------------------------------+
|  2 | Shirt  | 10.50 |    78 | {"size": 42, "colour": "white"} |
|  3 | Blouse | 17.00 |    15 | {"colour": "white"}             |
+----+--------+-------+-------+---------------------------------+

UPDATE
  Clothes
SET
  attr = JSON_INSERT(attr, '$.size', 40);
WHERE
	id = 3;
    
+----+--------+-------+-------+---------------------------------+
| id | name   | price | stock | attr                            |
+----+--------+-------+-------+---------------------------------+
|  2 | Shirt  | 10.50 |    78 | {"size": 42, "colour": "white"} |
|  3 | Blouse | 17.00 |    15 | {"colour": "white", "size": 40} |
+----+--------+-------+-------+---------------------------------+

Code Example 3

+----+--------+-------+-------+---------------------------------+
| id | name   | price | stock | attr                            |
+----+--------+-------+-------+---------------------------------+
|  2 | Shirt  | 10.50 |    78 | {"size": 42, "colour": "white"} |
|  3 | Blouse | 17.00 |    15 | {"colour": "white"}             |
+----+--------+-------+-------+---------------------------------+
  
SELECT name FROM clothes WHERE JSON_EXTRACT(attr, '$.size') = 42;

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