MongoDB $nor 运算符 ($nor)

17 Mar 2025 | 4 分钟阅读

MongoDB 提供了各种逻辑查询运算符。 $nor 运算符是其中一个运算符。 $nor 运算符用于对一个或多个表达式的数组执行逻辑 "NOR 运算"。换句话说， $nor 是一个逻辑查询运算符，允许用户对一个或多个查询表达式的数组执行逻辑 NOR 运算。此运算符还用于选择或检索与数组中所有给定表达式都不匹配的文档。用户可以根据他们的需求在 find()、update() 等方法中使用此运算符。

语法

示例

在下面的示例中，我们将使用

Database: JavaTpoint
Collection: student
Document: Five documents that contain the details of the students

>db.student.find()
{
           "_id" : ObjectId("56254d4fdf2222265r4g12ds3d65f"),
           "name" : "Mick",
           "Course" : "btech",
           "batch_year" : 2018,
           "language" : ["c++", "java", "python"],
           "personal_details" : 
                     {
                      "Father_name" : "Jonny",
                      "phone_no" : 8895321456,
                      "age" : 23,
                      "gender" : "Male",
                      "City" : "NewYork",
                     }            
}
{
           "_id" : ObjectId("56254d4fdf2222265r4g12ds3d691"),
           "name" : "Zoya",
           "Course" : "BCA",
           "batch_year" : 2020,
           "language" : ["C#", "JavaScript"],
           "personal_details" : 
                     {
                      "Father_name" : "Henry",
                      "phone_no" : 9874563698,
                      "age" : 20,
                      "gender" : "Female",
                      "City" : "London",
                     }
}
{
           "_id" : ObjectId("56254d4fdf2222265r4g12ds3d655"),
           "name" : "Jonny",
           "Course" : "MCA",
           "batch_year" : 2019,
           "language" : ["C#", "java", "PHP"],
           "personal_details" : 
                     {
                      "Father_name" : "Thomas",
                      "phone_no" : 7845123698,
                      "age" : 24,
                      "gender" : "Male",
                      "City" : "London",
                     }          
}
{
           "_id" : ObjectId("56254d4fdf2222265r4g12ds3d678"),
           "name" : "Oliver",
           "Course" : "BA",
           "batch_year" : 2017,
           "language" : ["c", "PHP"],
           "personal_details" : 
                     {
                      "Father_name" : "William",
                      "phone_no" : 9997845123,
                      "age" : 25,
                      "gender" : "Male",
                      "City" : "Liverpool",
                     }           
}
{
           "_id" : ObjectId("56254d4fdf2222265r4g12ds3d665"),
           "name" : "Mia",
           "Course" : "btech",
           "batch_year" : 2020,
           "language" : ["HTML", "CSS", "PHP"],
           "personal_details" : 
                     {
                      "Father_name" : "Leo",
                      "phone_no" : 6312547896,
                      "age" : 22,
                      "gender" : "Female",
                      "City" : "Manchester",
                     }           
}

示例 1：使用 $nor 运算符匹配值

在此示例中，我们仅检索课程不是 btech 的学生的资料。

输出

>db.student.find({$nor: [{Course: "btech"}]}).pretty()
{
           "_id" : ObjectId("56254d4fdf2222265r4g12ds3d691"),
           "name" : "Zoya",
           "Course" : "BCA",
           "batch_year" : 2020,
           "language" : ["C#", "JavaScript"],
           "personal_details" : 
                     {
                      "Father_name" : "Henry",
                      "phone_no" : 9874563698,
                      "age" : 20,
                      "gender" : "Female",
                      "City" : "London",
                     }
}
{
           "_id" : ObjectId("56254d4fdf2222265r4g12ds3d655"),
           "name" : "Jonny",
           "Course" : "MCA",
           "batch_year" : 2019,
           "language" : ["C#", "java", "PHP"],
           "personal_details" : 
                     {
                      "Father_name" : "Thomas",
                      "phone_no" : 7845123698,
                      "age" : 24,
                      "gender" : "Male",
                      "City" : "London",
                     }          
}
{
           "_id" : ObjectId("56254d4fdf2222265r4g12ds3d678"),
           "name" : "Oliver",
           "Course" : "BA",
           "batch_year" : 2017,
           "language" : ["c", "PHP"],
           "personal_details" : 
                     {
                      "Father_name" : "William",
                      "phone_no" : 9997845123,
                      "age" : 25,
                      "gender" : "Male",
                      "City" : "Liverpool",
                     }           
}

示例 2：使用 $nor 运算符匹配两个值

在此示例中，我们仅检索课程不是 btech 且入学年份不是 2017 年的学生的资料。

输出

>db.student.find({$nor: [{Course: "btech"}, {batch_year: "2017"}]}).pretty()
{
           "_id" : ObjectId("56254d4fdf2222265r4g12ds3d691"),
           "name" : "Zoya",
           "Course" : "BCA",
           "batch_year" : 2020,
           "language" : ["C#", "JavaScript"],
           "personal_details" : 
                     {
                      "Father_name" : "Henry",
                      "phone_no" : 9874563698,
                      "age" : 20,
                      "gender" : "Female",
                      "City" : "London",
                     }
}
{
           "_id" : ObjectId("56254d4fdf2222265r4g12ds3d655"),
           "name" : "Jonny",
           "Course" : "MCA",
           "batch_year" : 2019,
           "language" : ["C#", "java", "PHP"],
           "personal_details" : 
                     {
                      "Father_name" : "Thomas",
                      "phone_no" : 7845123698,
                      "age" : 24,
                      "gender" : "Male",
                      "City" : "London",
                     }          
}

示例 3：使用 $nor 运算符匹配数组中的值

在此示例中，我们仅检索与给定数组不匹配的学生的资料。

输出

> db.student.find({$nor: [{language: {$in: ["Java", "C#"]}}]}).pretty()
{
           "_id" : ObjectId("56254d4fdf2222265r4g12ds3d678"),
           "name" : "Oliver",
           "Course" : "BA",
           "batch_year" : 2017,
           "language" : ["c", "PHP"],
           "personal_details" : 
                     {
                      "Father_name" : "William",
                      "phone_no" : 9997845123,
                      "age" : 25,
                      "gender" : "Male",
                      "City" : "Liverpool",
                     }           
}
{
           "_id" : ObjectId("56254d4fdf2222265r4g12ds3d665"),
           "name" : "Mia",
           "Course" : "btech",
           "batch_year" : 2020,
           "language" : ["HTML", "CSS", "PHP"],
           "personal_details" : 
                     {
                      "Father_name" : "Leo",
                      "phone_no" : 6312547896,
                      "age" : 22,
                      "gender" : "Female",
                      "City" : "Manchester",
                     }           
}

示例 4：MongoDB 逻辑 $nor 运算符（检索嵌入文档中的数据）

在此示例中，我们仅获取城市不是 "伦敦" 且年龄不是 22 岁的学生的资料。

>db.student.find({$nor: [{"personal.age": 22}, {"personal.city": "London"}]}).pretty()

输出

>db.student.find({$nor: [{"personal.age": 22}, {"personal.city": "London"}]}).pretty()
{
           "_id" : ObjectId("56254d4fdf2222265r4g12ds3d65f"),
           "name" : "Mick",
           "Course" : "btech",
           "batch_year" : 2018,
           "language" : ["c++", "java", "python"],
           "personal_details" : 
                     {
                      "Father_name" : "Jonny",
                      "phone_no" : 8895321456,
                      "age" : 23,
                      "gender" : "Male",
                      "City" : "NewYork",
                     }            
}
{
           "_id" : ObjectId("56254d4fdf2222265r4g12ds3d678"),
           "name" : "Oliver",
           "Course" : "BA",
           "batch_year" : 2017,
           "language" : ["c", "PHP"],
           "personal_details" : 
                     {
                      "Father_name" : "William",
                      "phone_no" : 9997845123,
                      "age" : 25,
                      "gender" : "Male",
                      "City" : "Liverpool",
                     }           
}

下一主题#

MongoDB $nor 运算符 ($nor)

语法

示例

示例 1：使用 $nor 运算符匹配值

示例 2：使用 $nor 运算符匹配两个值

示例 3：使用 $nor 运算符匹配数组中的值

示例 4：MongoDB 逻辑 $nor 运算符（检索嵌入文档中的数据）

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面试题

MongoDB $nor 运算符 ($nor)

语法

示例

示例 1：使用 $nor 运算符匹配值

示例 2：使用 $nor 运算符匹配两个值

示例 3：使用 $nor 运算符匹配数组中的值

示例 4：MongoDB 逻辑 $nor 运算符（检索嵌入文档中的数据）

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