Cannot alter the table to set a foreign key

Question

When I am trying to add a foreign key to my column I am getting an error. Please let me know what is wrong with it.

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

Error:

1005 - Can't create table mydb . #sql-1cc_564 (errno: 150 "Foreign key constraint is incorrectly formed")

Answer 1

My impression is that newdb is a schema name and not a table name. I would expect something like

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