script fix

IdentityServer.Domain.Data/Scripts/1.0.1/02.New structure for AppUser table.sql

@@ -14,7 +14,7 @@ begin
 		[Password] varchar(100) not null,
 		FirstName varchar(100),
 		LastName varchar(100),
-		Email varchar(100) constraint UQ_AppUser_Email unique,
+		Email varchar(100),
 		ProfilePictureUrl varchar(200),
 		SecurityStamp varchar(200) constraint UQ_AppUser_SecurityStamp unique,
 		StatusId int not null constraint FK_AppUser_UserStatus references UserStatus(StatusId),
@@ -26,6 +26,14 @@ begin
 end
 go
 
+if not exists (select top 1 1 from sys.indexes where name = 'IDX_AppUser_Email_NOTNULL' AND object_id = OBJECT_ID('AppUser'))
+begin
+	CREATE UNIQUE NONCLUSTERED INDEX IDX_AppUser_Email_NOTNULL
+	ON AppUser(Email)
+	WHERE Email IS NOT NULL
+end
+go
+
 if not exists (select top 1 1 from AppUser)
 begin
 	declare @activeStatusId int