ES查询学习

常用查询

match_all       查询所有
match    	分词匹配查询, 模糊查询
term     	精确查找, 单个字段等值匹配
terms		多个字段等值匹配

基础查询

{
	"query": {"match": {}}     			        # 编写查询条件
	"size": 1				   		# 返回数量, 默认为10
	"from": 10					        # 索引下标, 从第几条开始, 默认为0
	"sort": {"length": {"order": "desc"}}		        # 按length进行降序排序
	"_source": ["id", "length"] 				# 返回多个字段
}

布尔查询

{
	"query": {
		"bool": {
			"must": [
				{"term": {'id': 110}},    	    ### must == and  必须两个都为真才会返回
				{"term": {'id': 111}}
			],
			"should": [
				{"match":  {'borough': "黑龙国际"}}, ### should == or  两个有一个为真才会返回
				{"match":  {'borough': "天下国际"}}
			],
			"must_not": [
				{"match": {'name': "国美花园"}},     ### must_not == not 全部为假才会返回
				{"match": {'name': "天坛公园"}},
			]
		}
	}
}
gt  大于		gte  大于等于		lt  小于		lte  小于等于

过滤查询(filter过滤条件)

{
	"query": {
		"bool": {
			"must": {"match_all": {}}, 
			"filter": {
				"range": {
					"price": {
						"gte": 1000,     ### 查询price字段在1000到2000之内的所有数据
						"lte": 2000 
					}
				}
			}
		}
	}
}
相当于  select * from complex where 1000 <= price and price <= 2000

聚合查询(Aggregations)

{
	"aggs": {
		"group_by_state": {
			"terms": {
				"field": "borough_name"   ### 所有数据按照小区名进行分组, 然后按照分组记录数从大到小排序
			}
		}
	},
	"size": 0   	### 只返回聚合结果
}
相当于  select borough_name, count(*) from complex group by borough_name order by count(*) desc

聚合查询里面执行求平均操作

{
	"aggs": {
		"group_by_state": {
			"terms": {
				"field": "borough_name"   ### 所有数据按照小区名进行分组, 然后按照分组记录数从大到小排序
			}
		},
		"aggs": {
			"average_balance": {
				"avg": {
					"field": "price"
				}
			}
		}
	},
	"size": 0   	### 只返回聚合结果
}
select borough_name, avg(price) ,count(*) from complex group by borough_name order by count(*) desc