文章目錄

• 概述
• 官方說明
• 示例

---

概述

繼續跟中華石杉老師學習ES，第46篇

課程地址： https://www.roncoo.com/view/55

---

官方說明

Cardinality Aggregation：戳這里

es中的去重，cartinality metric，對每個bucket中的指定的field進行去重，取去重后的count，類似于count(distcint)

---

示例

GET /tvs/sales/_search {"aggs": {"month":{"date_histogram": {"field": "sold_date","interval": "month"},"aggs": {"distinct_brand_cnt": {"cardinality": {"field": "brand"}}}}},"size": 0 }

返回：

{"took": 8,"timed_out": false,"_shards": {"total": 5,"successful": 5,"skipped": 0,"failed": 0},"hits": {"total": 8,"max_score": 0,"hits": []},"aggregations": {"month": {"buckets": [{"key_as_string": "2016-05-01T00:00:00.000Z","key": 1462060800000,"doc_count": 1,"distinct_brand_cnt": {"value": 1}},{"key_as_string": "2016-06-01T00:00:00.000Z","key": 1464739200000,"doc_count": 0,"distinct_brand_cnt": {"value": 0}},{"key_as_string": "2016-07-01T00:00:00.000Z","key": 1467331200000,"doc_count": 1,"distinct_brand_cnt": {"value": 1}},{"key_as_string": "2016-08-01T00:00:00.000Z","key": 1470009600000,"doc_count": 1,"distinct_brand_cnt": {"value": 1}},{"key_as_string": "2016-09-01T00:00:00.000Z","key": 1472688000000,"doc_count": 0,"distinct_brand_cnt": {"value": 0}},{"key_as_string": "2016-10-01T00:00:00.000Z","key": 1475280000000,"doc_count": 1,"distinct_brand_cnt": {"value": 1}},{"key_as_string": "2016-11-01T00:00:00.000Z","key": 1477958400000,"doc_count": 2,"distinct_brand_cnt": {"value": 1}},{"key_as_string": "2016-12-01T00:00:00.000Z","key": 1480550400000,"doc_count": 0,"distinct_brand_cnt": {"value": 0}},{"key_as_string": "2017-01-01T00:00:00.000Z","key": 1483228800000,"doc_count": 1,"distinct_brand_cnt": {"value": 1}},{"key_as_string": "2017-02-01T00:00:00.000Z","key": 1485907200000,"doc_count": 1,"distinct_brand_cnt": {"value": 1}}]}} }

我們來看下原始數據：

來看下我們的統計結果，找個 2016-11

統計正確。

總結

以上是生活随笔為你收集整理的白话Elasticsearch46-深入聚合数据分析之Cardinality Aggs-cardinality去重算法以及每月销售品牌数量统计的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。