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create table mytable as select 'A' param, 200.5 value union all select 'B', 70.2;
Records: 2  Duplicates: 0  Warnings: 0
select concat('{', group_concat('"', param, '": ', value separator ', '), '}' ) js
from mytable
js
{"A": 200.5, "B": 70.2}