Documentdb Sql 简明教程

DocumentDB SQL - In Keyword

IN 关键字可用于检查指定值是否与列表中的任何值匹配。IN 运算符允许您在 WHERE 子句中指定多个值。IN 等同于链接多个 OR 子句。

与先前示例中所做一样，考虑相同的三个文档。以下是 AndersenFamily 文档。

{
   "id": "AndersenFamily",
   "lastName": "Andersen",

   "parents": [
      { "firstName": "Thomas", "relationship":  "father" },
      { "firstName": "Mary Kay", "relationship":  "mother" }
   ],

   "children": [
      {
         "firstName": "Henriette Thaulow",
         "gender": "female",
         "grade": 5,
         "pets": [ { "givenName": "Fluffy", "type":  "Rabbit" } ]
      }
   ],

   "location": { "state": "WA", "county": "King", "city": "Seattle" },
   "isRegistered": true
}

以下是 SmithFamily 文档。

{
   "id": "SmithFamily",

   "parents": [
      { "familyName": "Smith", "givenName": "James" },
      { "familyName": "Curtis", "givenName": "Helen" }
   ],

   "children": [
      {
         "givenName": "Michelle",
         "gender": "female",
         "grade": 1
      },

      {
         "givenName": "John",
         "gender": "male",
         "grade": 7,

         "pets": [
            { "givenName": "Tweetie", "type": "Bird" }
         ]
      }
   ],

   "location": {
      "state": "NY",
      "county": "Queens",
      "city": "Forest Hills"
   },

   "isRegistered": true
}

以下是 WakefieldFamily 文档。

{
   "id": "WakefieldFamily",

   "parents": [
      { "familyName": "Wakefield", "givenName": "Robin" },
      { "familyName": "Miller", "givenName": "Ben" }
   ],

   "children": [
      {
         "familyName": "Merriam",
         "givenName": "Jesse",
         "gender": "female",
         "grade": 6,

         "pets": [
            { "givenName": "Charlie Brown", "type": "Dog" },
            { "givenName": "Tiger", "type": "Cat" },
            { "givenName": "Princess", "type": "Cat" }
         ]
      },

      {
         "familyName": "Miller",
         "givenName": "Lisa",
         "gender": "female",
         "grade": 3,

         "pets": [
            { "givenName": "Jake", "type": "Snake" }
         ]
      }
   ],

   "location": { "state": "NY", "county": "Manhattan", "city": "NY" },
   "isRegistered": false
}

我们来看一个简单的例子。

in keyword

以下查询将检索 familyName 为 “Smith”或 Wakefield 的数据。

SELECT *
FROM Families.parents[0] f
WHERE f.familyName IN ('Smith', 'Wakefield')

执行以上查询后，将产生以下输出。

[
   {
      "familyName": "Wakefield",
      "givenName": "Robin"
   },

   {
      "familyName": "Smith",
      "givenName": "James"
   }
]

我们来考虑另一个示例，其中将检索所有 id 为 "SmithFamily" 或 "AndersenFamily" 的家庭文档。以下是查询。

SELECT *
FROM Families
WHERE Families.id IN ('SmithFamily', 'AndersenFamily')

执行以上查询后，将产生以下输出。

[
   {
      "id": "SmithFamily",
      "parents": [
         {
            "familyName": "Smith",
            "givenName": "James"
         },

         {
            "familyName": "Curtis",
            "givenName": "Helen"
         }
      ],

      "children": [
         {
            "givenName": "Michelle",
            "gender": "female",
            "grade": 1
         },

         {
            "givenName": "John",
            "gender": "male",
            "grade": 7,

            "pets": [
               {
                  "givenName": "Tweetie",
                  "type": "Bird"
               }
            ]
         }
      ],

      "location": {
         "state": "NY",
         "county": "Queens",
         "city": "Forest Hills"
      },

      "isRegistered": true,
      "_rid": "Ic8LAJFujgEDAAAAAAAAAA==",
      "_ts": 1450541623,
      "_self": "dbs/Ic8LAA==/colls/Ic8LAJFujgE=/docs/Ic8LAJFujgEDAAAAAAAAAA==/",
      "_etag": "\"00000600-0000-0000-0000-567582370000\"",
      "_attachments": "attachments/"
   },

   {
      "id": "AndersenFamily",
      "lastName": "Andersen",

      "parents": [
         {
            "firstName": "Thomas",
            "relationship": "father"
         },

         {
            "firstName": "Mary Kay",
            "relationship": "mother"
         }
      ],

      "children": [
         {
            "firstName": "Henriette Thaulow",
            "gender": "female",
            "grade": 5,

            "pets": [
               {
                  "givenName": "Fluffy",
                  "type": "Rabbit"
               }
            ]
         }
      ],

      "location": {
         "state": "WA",
         "county": "King",
         "city": "Seattle"
      },

      "isRegistered": true,
      "_rid": "Ic8LAJFujgEEAAAAAAAAAA==",
      "_ts": 1450541624,
      "_self": "dbs/Ic8LAA==/colls/Ic8LAJFujgE=/docs/Ic8LAJFujgEEAAAAAAAAAA==/",
      "_etag": "\"00000700-0000-0000-0000-567582380000\"",
      "_attachments": "attachments/"
   }
]