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无法更改表以设置外键

[英]Cannot alter the table to set a foreign key

When I am trying to add a foreign key to my column I am getting an error. 当我尝试向列添加外键时,出现错误。 Please let me know what is wrong with it. 请让我知道它有什么问题。

ALTER TABLE address
ADD CONSTRAINT FK_employeeid
FOREIGN KEY (employeeid) REFERENCES newdb(employeeid);

Error: 错误:

1005 - Can't create table mydb . 1005-无法创建表mydb #sql-1cc_564 (errno: 150 "Foreign key constraint is incorrectly formed") #sql-1cc_564 (错误号:150“外键约束#sql-1cc_564不正确”)

My impression is that newdb is a schema name and not a table name. 我的印象是newdb是架构名称,而不是表名称。 I would expect something like 我希望有类似的东西

ALTER TABLE address
ADD CONSTRAINT FK_employeeid
FOREIGN KEY (employeeid) REFERENCES newdb.Employees(employeeid);

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