[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-04 UTC."],[],[],null,["# Class AggregateField (9.1.0)\n\nVersion latestkeyboard_arrow_down\n\n- [9.1.0 (latest)](/nodejs/docs/reference/datastore/latest/datastore/aggregatefield)\n- [8.7.0](/nodejs/docs/reference/datastore/8.7.0/datastore/aggregatefield)\n- [8.6.0](/nodejs/docs/reference/datastore/8.6.0/datastore/aggregatefield)\n- [8.5.0](/nodejs/docs/reference/datastore/8.5.0/datastore/aggregatefield)\n- [8.4.0](/nodejs/docs/reference/datastore/8.4.0/datastore/aggregatefield)\n- [8.3.0](/nodejs/docs/reference/datastore/8.3.0/datastore/aggregatefield)\n- [8.2.2](/nodejs/docs/reference/datastore/8.2.2/datastore/aggregatefield)\n- [8.1.0](/nodejs/docs/reference/datastore/8.1.0/datastore/aggregatefield)\n- [8.0.0](/nodejs/docs/reference/datastore/8.0.0/datastore/aggregatefield)\n- [6.6.2](/nodejs/docs/reference/datastore/6.6.2/datastore/aggregatefield)\n- [6.5.0](/nodejs/docs/reference/datastore/6.5.0/datastore/aggregatefield)\n- [6.4.8](/nodejs/docs/reference/datastore/6.4.8/datastore/aggregatefield)\n- [6.3.1](/nodejs/docs/reference/datastore/6.3.1/datastore/aggregatefield) \nAn AggregateField is a class that contains data that defines an aggregation.\n\nPackage\n-------\n\n[@google-cloud/datastore](../overview.html)\n\nProperties\n----------\n\n### alias_\n\n alias_?: string;\n\nMethods\n-------\n\n### alias(alias)\n\n alias(alias?: string): AggregateField;\n\nSets the alias on the aggregate field that should be used.\n\n### average(property)\n\n static average(property: string): Average;\n\nGets a copy of the Average aggregate field.\n\n### count()\n\n static count(): Count;\n\nGets a copy of the Count aggregate field.\n\n### sum(property)\n\n static sum(property: string): Sum;\n\nGets a copy of the Sum aggregate field.\n\n### toProto()\n\n abstract toProto(): any;\n\nGets the proto for the aggregate field."]]