如何在MySQL中查看级联？

要查看级联，请在MySQL中使用SHOW CREATE TABLE。让我们首先创建一个表-

mysql> create table DemoTable1378
   -> (
   -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> EmployeeId varchar(20),
   -> EmployeeFirstName varchar(20),
   -> EmployeeLastName varchar(20),
   -> EmployeeCountryName varchar(40),
   -> EmployeeAge int,
   -> EmployeeSalary int,
   -> UNIQUE(EmployeeFirstName,EmployeeSalary),
   -> INDEX First_Last_NameIndex(EmployeeFirstName,EmployeeLastName)
   -> );

现在让我们查看MySQL中的级联-

mysql> show create table DemoTable1378;

这将产生以下输出-

+---------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table         | Create Table                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+---------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| DemoTable1378 | CREATE TABLE `demotable1378` (
  `Id` int(11) NOT NULL AUTO_INCREMENT,
  `EmployeeId` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL,
  `EmployeeFirstName` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL,
  `EmployeeLastName` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL,
  `EmployeeCountryName` varchar(40) COLLATE utf8_unicode_ci DEFAULT NULL,
  `EmployeeAge` int(11) DEFAULT NULL,
  `EmployeeSalary` int(11) DEFAULT NULL,
  PRIMARY KEY (`Id`),
  UNIQUE KEY `EmployeeFirstName` (`EmployeeFirstName`,`EmployeeSalary`),
  KEY `First_Last_NameIndex` (`EmployeeFirstName`,`EmployeeLastName`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci |
+---------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.02 sec)