UPDATE TeacherSite TS set OwnerSiteId=
	(SELECT
		TS2.HybridUserId, ST.WebSiteId
 	 FROM
		SchoolSite_Teachers ST INNER JOIN
		HybridUser U ON ST.HybridUserId = U.Id
	 WHERE
		TS.HybridUserId = TS2.HybridUserId
	)