Correlated subquery in SQL

Question

I have two tables: Table A and Table B

1. Table A and Table B both have RowId column.
2. Table A and Table B both have ModifiedAt col

Answer 1

DECLARE @RowId INT

DECLARE CurRowId CURSOR FOR SELECT RowId FROM Patients

OPEN CurRowId

FETCH NEXT FROM CurRowId INTO @RowId

WHILE @@FETCH_STATUS = 0

BEGIN

if not exists (select * from dbo.ResultsStored where ModifiedAt >

                 (select ModifiedAt from dbo.Patients where RowId = 
                                                                   @RowId))

begin

print'not exists'

end

else

begin

print 'exists'

END

FETCH  NEXT FROM CurRowId INTO @RowId

END