Aggregates

Aggregate functions such as sum, max etc. are readily available in Datomic's Datalog implementation. They are written in the :find clause in your query:

[:find (max ?date)
 :where
 ...]

An aggregate function collects values from multiple datoms and returns

• A single value: min, max, sum, avg, etc.
• A collection of values: (min n ?d) (max n ?d) (sample n ?e) etc. where n is an integer specifying the size of the collection.