apoc.agg.minItems
Function
apoc.agg.minItems(items Any, value Any, groupLimit Integer)
- returns a map {items:[], value:n} where the value
key is the minimum 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: "Tom Hanks", dateOfBirth: date("1956-07-09")});
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: "Carrie Fisher", dateOfBirth: date("1956-10-21")});
CREATE (:Person {name: "Bryan Cranston", dateOfBirth: date("1956-03-07")});
You can collect the people that have the minimal year of birth by running the following query:
MATCH (p:Person)
WITH apoc.agg.minItems(p, p.dateOfBirth.year) AS minItems
RETURN minItems.value AS value, minItems.items AS items;
value | items |
---|---|
1956 |
[(:Person {name: "Tom Hanks", dateOfBirth: 1956-07-09}), (:Person {name: "Carrie Fisher", dateOfBirth: 1956-10-21}), (:Person {name: "Bryan Cranston", dateOfBirth: 1956-03-07})] |
You can set the groupLimit
(3rd parameter) to set a limit on the number of items returned:
MATCH (p:Person)
WITH apoc.agg.minItems(p, p.dateOfBirth.year, 2) AS minItems
RETURN minItems.value AS value, minItems.items AS items;
value | items |
---|---|
1956 |
[(:Person {name: "Tom Hanks", dateOfBirth: 1956-07-09}), (:Person {name: "Carrie Fisher", dateOfBirth: 1956-10-21})] |
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