merging many jsonb objects using aggregate functions in PostgreSQL?

merging many jsonb objects using aggregate functions in PostgreSQL?

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Postgresql array agg, jsonb build object
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Postgresql array agg, jsonb build object

Postgresql array agg, jsonb build object
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Databases: Postgresql: Aggregate objects into an (json) array (subquery issues)
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SQL : How to join jsonb array elements in Postgres?
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