文章目录

• 概述
• 案例

概述

继续跟中华石杉老师学习ES，第41篇

课程地址： https://www.roncoo.com/view/55

案例

需求： 统计价格大于2000的电视的平均价格

原始数据：

不多说了，很简单，只需要在查询的时候过滤下即可

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

返回结果：

{
"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
}
}
}

我们把原始数据也返回(去掉

"size": 0

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": "红色",
"brand": "长虹",
"sold_date": "2016-11-05"
}
},
{
"_index": "tvs",
"_type": "sales",
"_id": "PzGrtGwBCp8vhw_gCmb9",
"_score": 1,
"_source": {
"price": 2000,
"color": "红色",
"brand": "长虹",
"sold_date": "2016-11-05"
}
},
{
"_index": "tvs",
"_type": "sales",
"_id": "QDGrtGwBCp8vhw_gCmb9",
"_score": 1,
"_source": {
"price": 3000,
"color": "绿色",
"brand": "小米",
"sold_date": "2016-05-18"
}
},
{
"_index": "tvs",
"_type": "sales",
"_id": "RDGrtGwBCp8vhw_gCmb9",
"_score": 1,
"_source": {
"price": 8000,
"color": "红色",
"brand": "三星",
"sold_date": "2017-01-01"
}
},
{
"_index": "tvs",
"_type": "sales",
"_id": "RTGrtGwBCp8vhw_gCmb9",
"_score": 1,
"_source": {
"price": 2500,
"color": "蓝色",
"brand": "小米",
"sold_date": "2017-02-12"
}
}
]
},
"aggregations": {
"avg_price": {
"value": 3500
}
}
}

比对下原始数据，可知正确。