Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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create table cities (city varchar(64), data json);
insert into cities values
('Moscow', '{"sum1":"10", "sum2":"5"}'),
('Moscow', '{"sum1":"10", "sum2":"5"}'),
('Paris', '{"sum1":"10", "sum2":"5"}');
select city,
json_object(
'sum1', sum(data->>"$.sum1"),
'sum2', sum(data->>"$.sum2")
) data
from cities
group by city
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