菜单
×
   ❮     
HTML CSS JAVASCRIPT SQL PYTHON JAVA PHP HOW TO W3.CSS C C++ C# BOOTSTRAP REACT MYSQL JQUERY EXCEL XML DJANGO NUMPY PANDAS NODEJS R TYPESCRIPT ANGULAR GIT POSTGRESQL MONGODB ASP AI GO KOTLIN SASS VUE DSA GEN AI SCIPY AWS CYBERSECURITY DATA SCIENCE
     ❯   

SQL 教程

SQL 首页 SQL Intro SQL Syntax SQL Select SQL Select Distinct SQL Where SQL Order By SQL And SQL Or SQL Not SQL Insert Into SQL Null Values SQL Update SQL Delete SQL Select Top SQL Aggregate Functions SQL Min and Max SQL Count SQL Sum SQL Avg SQL Like SQL Wildcards SQL In SQL Between SQL Aliases SQL Joins SQL Inner Join SQL Left Join SQL Right Join SQL Full Join SQL Self Join SQL Union SQL Group By SQL Having SQL Exists SQL Any, All SQL Select Into SQL Insert Into Select SQL Case SQL Null Functions SQL Stored Procedures SQL Comments SQL Operators

SQL 数据库

SQL Create DB SQL Drop DB SQL Backup DB SQL Create Table SQL Drop Table SQL Alter Table SQL Constraints SQL Not Null SQL Unique SQL Primary Key SQL Foreign Key SQL Check SQL Default SQL Index SQL Auto Increment SQL Dates SQL Views SQL Injection SQL Hosting SQL Data Types

SQL 参考

SQL 关键字 MySQL 函数 SQL Server 函数 MS Access 函数 SQL 快速参考

SQL 示例

SQL 示例 SQL 编辑器 SQL 测验 SQL 练习 SQL Server SQL Bootcamp SQL 证书

SQL HAVING 子句


SQL HAVING 子句

SQL HAVING 子句的出现是因为 WHERE 关键字不能与聚合函数一起使用。

HAVING 语法

SELECT column_name(s)
FROM table_name
WHERE 条件
GROUP BY column_name(s)
HAVING condition
ORDER BY column_name(s);

演示数据库

以下是 Northwind 示例数据库中“Customers”表的选段

CustomerID CustomerName ContactName Address City PostalCode Country
1

Alfreds Futterkiste Maria Anders Obere Str. 57 Berlin 12209 Germany
2 Ana Trujillo Emparedados y helados Ana Trujillo Avda. de la Constitución 2222 México D.F. 05021 Mexico
3 Antonio Moreno Taquería Antonio Moreno Mataderos 2312 México D.F. 05023 Mexico
4

Around the Horn Thomas Hardy 120 Hanover Sq. London WA1 1DP UK
5 Berglunds snabbköp Christina Berglund Berguvsvägen 8 Luleå S-958 22 Sweden

SQL HAVING 示例

以下 SQL 语句列出了每个国家的客户数量。仅包含客户数量超过 5 的国家

示例

SELECT COUNT(CustomerID), Country
FROM Customers
GROUP BY Country
HAVING COUNT(CustomerID) > 5;
自己动手试一试 »

以下 SQL 语句列出了每个国家的客户数量,并按降序排序(仅包含客户数量超过 5 的国家)

示例

SELECT COUNT(CustomerID), Country
FROM Customers
GROUP BY Country
HAVING COUNT(CustomerID) > 5
ORDER BY COUNT(CustomerID) DESC;
自己动手试一试 »


演示数据库

以下是 Northwind 示例数据库中“Orders”表的选段

OrderID CustomerID EmployeeID OrderDate ShipperID
10248 90 5 1996-07-04 3
10249 81 6 1996-07-05 1
10250 34 4 1996-07-08 2

并选择“Employees”表中的内容

EmployeeID LastName FirstName BirthDate Photo 注意
1 Davolio Nancy 1968-12-08 EmpID1.pic Education includes a BA....
2 Fuller Andrew 1952-02-19 EmpID2.pic Andrew received his BTS....
3 Leverling Janet 1963-08-30 EmpID3.pic Janet has a BS degree....

更多 HAVING 示例

以下 SQL 语句列出了已注册超过 10 个订单的员工

示例

SELECT Employees.LastName, COUNT(Orders.OrderID) AS NumberOfOrders
FROM (Orders
INNER JOIN Employees ON Orders.EmployeeID = Employees.EmployeeID)
GROUP BY LastName
HAVING COUNT(Orders.OrderID) > 10;
自己动手试一试 »

以下 SQL 语句列出了员工“Davolio”或“Fuller”是否已注册超过 25 个订单

示例

SELECT Employees.LastName, COUNT(Orders.OrderID) AS NumberOfOrders
FROM Orders
INNER JOIN Employees ON Orders.EmployeeID = Employees.EmployeeID
WHERE LastName = 'Davolio' OR LastName = 'Fuller'
GROUP BY LastName
HAVING COUNT(Orders.OrderID) > 25;
自己动手试一试 »

×

联系销售

如果您想将 W3Schools 服务用于教育机构、团队或企业,请发送电子邮件给我们
sales@w3schools.com

报告错误

如果您想报告错误,或想提出建议,请发送电子邮件给我们
help@w3schools.com

W3Schools 经过优化,旨在方便学习和培训。示例可能经过简化,以提高阅读和学习体验。教程、参考资料和示例会不断审查,以避免错误,但我们无法保证所有内容的完全正确性。使用 W3Schools 即表示您已阅读并接受我们的使用条款Cookie 和隐私政策

版权所有 1999-2024 Refsnes Data。保留所有权利。W3Schools 由 W3.CSS 提供支持