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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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