i think we did it~~~~~~~

Chinook_Rev1.sql

@@ -1,5 +1,5 @@
 USE `chinook`;
-
+SET SQL_SAFE_UPDATES = 0;
 
 /*******************************************************************************
    Create Tables
@@ -122,10 +122,9 @@ INSERT INTO Person(FirstName, LastName, Address, City, State, Country, PostalCod
 SELECT FirstName, LastName, Address, City, State, Country, PostalCode, Phone, Fax, Email,EmployeeId
 FROM Employee;
 
-INSERT INTO Employee (PersonId)
-SELECT PersonId
-FROM Person
-WHERE PersonId > @var1;
+Update Employee 
+INNER JOIN Person ON (Person.EmployeeId = Employee.EmployeeId)
+SET Employee.PersonId = Person.PersonId;
 
 ALTER TABLE Person
 DROP COLUMN EmployeeId;
@@ -220,7 +219,7 @@ CREATE INDEX `IFK_TrackURLID` ON `TrackURL` (`TrackID`);
 ALTER TABLE `Invoice` ADD CONSTRAINT `FK_PayId`
 	FOREIGN KEY (`PayId`) REFERENCES `Payment` (`PayId`) ON DELETE NO ACTION ON UPDATE NO ACTION;
 
-CREATE INDEX `IFK_PayId` ON `PayId` (`PayId`);
+CREATE INDEX `IFK_PayId` ON `Invoice` (`PayId`);