apoc.agg.maxItems
Function
apoc.agg.maxItems(items Any, value Any, groupLimit Integer)
- returns a map {items:[], value:n} where the value
key is the maximum value present, and items
represent all items with the same value.
The size of the list of items can be limited to a given max size.
Usage examples
The examples in this section are based on the following sample graph of people and their dates of birth:
CREATE (:Person {name: "Christopher Nolan", dateOfBirth: date("1970-07-30")});
CREATE (:Person {name: "Tom Cruise", dateOfBirth: date("1962-07-03")});
CREATE (:Person {name: "Nicole Kidman", dateOfBirth: date("1967-06-20")});
CREATE (:Person {name: "Matt Damon", dateOfBirth: date("1970-10-08")});
CREATE (:Person {name: "Jennifer Connelly", dateOfBirth: date("1970-12-12")});
You can collect the people that have the maximal year of birth by running the following query:
MATCH (p:Person)
WITH apoc.agg.maxItems(p, p.dateOfBirth.year) AS maxItems
RETURN maxItems.value AS value, maxItems.items AS items;
value | items |
---|---|
1970 |
[(:Person {name: "Christopher Nolan", dateOfBirth: 1970-07-30}), (:Person {name: "Matt Damon", dateOfBirth: 1970-10-08}), (:Person {name: "Jennifer Connelly", dateOfBirth: 1970-12-12})] |
You can set the groupLimit
(3rd parameter) to set a limit on the number of items returned:
MATCH (p:Person)
WITH apoc.agg.maxItems(p, p.dateOfBirth.year, 2) AS maxItems
RETURN maxItems.value AS value, maxItems.items AS items;
value | items |
---|---|
1970 |
[(:Person {name: "Christopher Nolan", dateOfBirth: 1970-07-30}), (:Person {name: "Matt Damon", dateOfBirth: 1970-10-08})] |
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