我怎样才能通过 n1ql 查询检索所有的孩子

Question

我打算检索所有 parent 中的 child 个元素，我如何检索它，在数组 objects 的数组中。

SELECT sd.* 
FROM test AS t
UNNEST stateDetails AS sd;

{
   "type":"countries",
   "docName":"CountryData",
   "countryDetails":[
      {
         "name":"US",
         "code":"+1",
         "stateInfo":[
            {
               "name":"Florida",
               "id":"1212"
            },
            {
               "name":"NewYork",
               "id":"1214"
            }
         ]
      },
       {
         "name":"France",
         "code":"+33",
         "stateInfo":[
            {
               "name":"Grand Est",
               "id":"5212"
            },
            {
               "name":"Brittany",
               "id":"5214"
            }
         ]
      }
   ]
}

我期待以下输出显示所有国家/地区的州详细信息及其各自的国家/地区名称

        [
            {
               "countryName":"US",
               "name":"Florida",
               "id":"1212"
            },
            {
               "countryName":"US",
               "name":"NewYork",
               "id":"1214"
            },
            {
               "countryName":"France",
               "name":"Grand Est",
               "id":"5212"
            },
            {
               "countryName":"France",
               "name":"Brittany",
               "id":"5214"
            }
         ]

Answer 1

使用双 UNNEST 并根据需要进行投影

SELECT cd.name AS countryName, sd.name, sd.id
FROM test AS t
UNNEST t.countryDetails AS cd
UNNEST cd.stateInfo AS sd
WHERE t.type = "countries";

我怎样才能通过 n1ql 查询检索所有的孩子

how can i retrieve all the childrens by n1ql query

spring-data-couchbase

n1ql