# date_histogram
实现需求：2016-01-01 ~ 2017-12-31 之间每个月的电视销量
GET /tvs/sales/_search
{
"size" : 0,
"aggs": {
"sales": {
"date_histogram": {
"field": "sold_date",
"interval": "month",
"format": "yyyy-MM-dd",
"min_doc_count" : 0,
"extended_bounds" : {
"min" : "2016-01-01",
"max" : "2017-12-31"
}
}
}
}
}
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这里就用到了 date_histogram 日期区间分组语法
min_doc_count：
即使某个日期 interval，2017-01-01~2017-01-31 中，一条数据都没有，那么这个区间也是要返回的，不然默认是会过滤掉这个区间的
extended_bounds
min，max：划分 bucket 的时候，会限定在这个起始日期，和截止日期内
响应结果
{
"took": 7,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 8,
"max_score": 0,
"hits": []
},
"aggregations": {
"dales": {
"buckets": [
{
"key_as_string": "2016-01-01",
"key": 1451606400000,
"doc_count": 0
},
{
"key_as_string": "2016-02-01",
"key": 1454284800000,
"doc_count": 0
},
{
"key_as_string": "2016-03-01",
"key": 1456790400000,
"doc_count": 0
},
{
"key_as_string": "2016-04-01",
"key": 1459468800000,
"doc_count": 0
},
{
"key_as_string": "2016-05-01",
"key": 1462060800000,
"doc_count": 1
},
{
"key_as_string": "2016-06-01",
"key": 1464739200000,
"doc_count": 0
},
{
"key_as_string": "2016-07-01",
"key": 1467331200000,
"doc_count": 1
},
{
"key_as_string": "2016-08-01",
"key": 1470009600000,
"doc_count": 1
},
{
"key_as_string": "2016-09-01",
"key": 1472688000000,
"doc_count": 0
},
{
"key_as_string": "2016-10-01",
"key": 1475280000000,
"doc_count": 1
},
{
"key_as_string": "2016-11-01",
"key": 1477958400000,
"doc_count": 2
},
{
"key_as_string": "2016-12-01",
"key": 1480550400000,
"doc_count": 0
},
{
"key_as_string": "2017-01-01",
"key": 1483228800000,
"doc_count": 1
},
{
"key_as_string": "2017-02-01",
"key": 1485907200000,
"doc_count": 1
},
{
"key_as_string": "2017-03-01",
"key": 1488326400000,
"doc_count": 0
},
{
"key_as_string": "2017-04-01",
"key": 1491004800000,
"doc_count": 0
},
{
"key_as_string": "2017-05-01",
"key": 1493596800000,
"doc_count": 0
},
{
"key_as_string": "2017-06-01",
"key": 1496275200000,
"doc_count": 0
},
{
"key_as_string": "2017-07-01",
"key": 1498867200000,
"doc_count": 0
},
{
"key_as_string": "2017-08-01",
"key": 1501545600000,
"doc_count": 0
},
{
"key_as_string": "2017-09-01",
"key": 1504224000000,
"doc_count": 0
},
{
"key_as_string": "2017-10-01",
"key": 1506816000000,
"doc_count": 0
},
{
"key_as_string": "2017-11-01",
"key": 1509494400000,
"doc_count": 0
},
{
"key_as_string": "2017-12-01",
"key": 1512086400000,
"doc_count": 0
}
]
}
}
}
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