Question

你好我正在尝试加入一个表Classes＆amp;员工一起使用外键＆＃34; Employee_Id＆＃34;从C表中获取E表中的名字和姓氏

SELECT     class_id, 
           subject_name, 
           classes.employee_id 
FROM       schooladmindb.classes 
INNER JOIN schooladmindb.employee 
ON 
where      classes.employee_id = employee.employee_id;

我不确定我必须使用的声明才能获得＆＃34; First_Name＆＃34; ＆安培; ＆＃34;姓氏＆＃34;从保持C表数据完整的E表

Answer 1

您的语句错误，因为您不需要WHERE加入两个表

检查 JOIN sintaxis

SELECT     class_id, 
           subject_name, 
           classes.employee_id 
FROM       schooladmindb.classes 
INNER JOIN schooladmindb.employee 
ON         classes.employee_id = employee.employee_id;

Answer 2

是的，您只需添加名字和姓氏以及其他字段，例如

SELECT     class_id, 
           subject_name, 
           employ_FirstName, // Column in your employee table
           employ_LastName,
           classes.employee_id 
FROM       schooladmindb.classes 
INNER JOIN schooladmindb.employee 
ON         classes.employee_id = employee.employee_id;

使用foregin密钥MySql从2个表加入

2 个答案: