文章目錄

• 概述
• 案例

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概述

繼續跟中華石杉老師學習ES，第41篇

課程地址： https://www.roncoo.com/view/55

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案例

需求： 統計價格大于2000的電視的平均價格

原始數據：

不多說了，很簡單，只需要在查詢的時候過濾下即可

GET /tvs/sales/_search {"query": {"range": {"price": {"gte": "2000"}}},"aggs": {"avg_price": {"avg": {"field": "price"}}},"size": 0 }

返回結果：

{"took": 7,"timed_out": false,"_shards": {"total": 5,"successful": 5,"skipped": 0,"failed": 0},"hits": {"total": 5,"max_score": 0,"hits": []},"aggregations": {"avg_price": {"value": 3500}} }

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我們把原始數據也返回(去掉 "size": 0)，來校驗下，是否正確。

GET /tvs/sales/_search {"query": {"range": {"price": {"gte": "2000"}}},"aggs": {"avg_price": {"avg": {"field": "price"}}} }

返回：

{"took": 27,"timed_out": false,"_shards": {"total": 5,"successful": 5,"skipped": 0,"failed": 0},"hits": {"total": 5,"max_score": 1,"hits": [{"_index": "tvs","_type": "sales","_id": "QzGrtGwBCp8vhw_gCmb9","_score": 1,"_source": {"price": 2000,"color": "紅色","brand": "長虹","sold_date": "2016-11-05"}},{"_index": "tvs","_type": "sales","_id": "PzGrtGwBCp8vhw_gCmb9","_score": 1,"_source": {"price": 2000,"color": "紅色","brand": "長虹","sold_date": "2016-11-05"}},{"_index": "tvs","_type": "sales","_id": "QDGrtGwBCp8vhw_gCmb9","_score": 1,"_source": {"price": 3000,"color": "綠色","brand": "小米","sold_date": "2016-05-18"}},{"_index": "tvs","_type": "sales","_id": "RDGrtGwBCp8vhw_gCmb9","_score": 1,"_source": {"price": 8000,"color": "紅色","brand": "三星","sold_date": "2017-01-01"}},{"_index": "tvs","_type": "sales","_id": "RTGrtGwBCp8vhw_gCmb9","_score": 1,"_source": {"price": 2500,"color": "藍色","brand": "小米","sold_date": "2017-02-12"}}]},"aggregations": {"avg_price": {"value": 3500}} }

比對下原始數據，可知正確。

總結

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