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aggregate-by-keys (clj)
(source)function
(aggregate-by-keys connectable table aggregate key-map)
(aggregate-by-keys connectable table aggregate key-map opts)
A wrapper over `find-by-keys` that additionally takes an aggregate SQL
expression (a string), and returns just a single result: the value of that
of that aggregate for the matching rows.
Accepts all the same options as `find-by-keys` except `:columns` since that
is used internally by this wrapper to pass the aggregate expression in.