Count json tags in sql

Question

I have this json strings

[{\"count\": 9, \"name\": \"fixkit\", \"label\": \"Repair Kit\"}, {\"count\": 1, \"name\": \"phone\", \"label\": \"Telefoon\"}]
[{\"coun         


        

Answer 1

If you are running MySQL 8.0, you can unnest the arrays into rows with json_table(), then filter on the names you are interested in, and aggregate.

Assuming that your table is mytable and that the json column is called js, that would be:

select j.name, sum(j.cnt) cnt
from mytable t
cross join json_table (
    t.js,
    '$[*]' columns(
        cnt int          path '$.count',
        name varchar(50) path '$.name'
    )
) j
where j.name in ('phone', 'fixkit')
group by j.name

Demo on DB Fiddle:

| name   | cnt |
| ------ | --- |
| fixkit | 9   |
| phone  | 16  |

Answer 2

If you're not using MySQL 8, this is a bit more complicated. First you have to find a path to a name element that has the value phone (or fixkit); then you can replace name in that path with count and extract the count field from that path; these values can then be summed:

SELECT param, SUM(JSON_EXTRACT(counts, REPLACE(JSON_UNQUOTE(JSON_SEARCH(counts, 'one', param, NULL, '$[*].name')), 'name', 'count'))) AS count
FROM data
CROSS JOIN (
  SELECT 'phone' AS param
  UNION ALL
  SELECT 'fixkit'
) params
WHERE JSON_SEARCH(counts, 'one', param, NULL, '$[*].name') IS NOT NULL
GROUP BY param

Output:

param   count
fixkit  9
phone   16

Demo on dbfiddle