MySQL：添加外键约束失败

问题描述

我有两个表clinics和consultations。
每个咨询记录都属于一个诊所，因此我想将clinic_name设置为引用clinic_name表中clinics的外键。但这会引发错误：

code: 'ER_FK_NO_INDEX_PARENT',errno: 1822,sqlMessage: "Failed to add the foreign key constraint. Missing index for constraint 'consultations_ibfk_1' in the referenced table 'clinics'",

诊所表：

const sql_createclinics =
  "CREATE TABLE IF NOT EXISTS clinics(" +
  "id INT AUTO_INCREMENT," +
  "email VARCHAR(255) NOT NULL," +
  "password VARCHAR(255) NOT NULL," +
  "clinic_name VARCHAR(255) NOT NULL," +
  "phone_num VARCHAR(15) NOT NULL," +
  "address VARCHAR(255) NOT NULL," +
  "PRIMARY KEY (id))";

**咨询表：**

const sql_createconsult =
  "CREATE TABLE IF NOT EXISTS consultations(" +
  "id INT AUTO_INCREMENT," +
  "clinic_name VARCHAR(255)," +
  "doctor_name VARCHAR(255)," +
  "patient_name VARCHAR(255)," +
  "diagnosis VARCHAR(255)," +
  "medication VARCHAR(255)," +
  "consultation_fee FLOAT," +
  "datetime DATETIME DEFAULT CURRENT_TIMESTAMP," +
  "PRIMARY KEY (id)," +
  "FOREIGN KEY (clinic_name) REFERENCES clinics(clinic_name))";

解决方法

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