.. meta:: :description: Make distinct queries with Hasura :keywords: hasura, docs, query, distinct query Distinct query results ====================== .. contents:: Table of contents :backlinks: none :depth: 2 :local: The **distinct_on** argument ---------------------------- You can fetch rows with only distinct values of a column using the ``distinct_on`` argument. It is typically recommended to use ``order_by`` along with ``distinct_on`` to ensure we get predictable results *(otherwise any arbitrary row with a distinct value of the column may be returned)*. Note that the ``distinct_on`` column needs to be the first column in the ``order_by`` expression. See :doc:`sort queries ` for more info on using ``order_by``. .. code-block:: graphql employee ( distinct_on: [employee_select_column] order_by: [employee_order_by] ): [employee]! # select column enum type for "employee" table enum employee_select_column { id name department salary } You can see the complete specification of the ``distinct_on`` argument in the :ref:`API reference `. Fetch results with distinct values of a particular field -------------------------------------------------------- **For example**, fetch the employee with the highest salary from each department: .. graphiql:: :view_only: :query: query { employee ( distinct_on: [department] order_by: [ {department: asc}, {salary: desc} ] ) { id name department salary } } :response: { "data": { "employee": [ { "id": 5, "name": "Kamila", "department": "Engineering", "salary": 4325 }, { "id": 4, "name": "Damien", "department": "Product", "salary": 3124 }, { "id": 7, "name": "Rickard", "department": "Services", "salary": 2223 } ] } }