Oh well, another question that does not rely on the workings of the database engine, but rather english comprehension.
I would say you comprehended just fine.
I would also say I do not see a concept or point being displayed by the question or it's explination. After furthur review...
DECLARE @t TABLE
(nDex INT IDENTITY(1,1)
VALUES ('a',NEWID()) , ('b',NEWID())
,('c',NEWID()) , ('d',NEWID())
,('e',NEWID()) , ('f',NEWID())
,('g',NEWID()) , ('h',NEWID())
,('i',NEWID()) , ('j',NEWID())
INTO #gT from @t;
FROM @t AS t
INNER JOIN (SELECT TOP 9 nDex
ORDER BY keey) AS b
ON b.ndex = t.nDex;
DROP TABLE #gT;
Seems that if you ORDER BY the name or alias of the column holding the NEWID() values and join to a #temp table of the records instead of the table you are deleting from (as you delete) the code always returns as I would expect it too.
The other code would seem to never produce the same amount of joinable values to return...
So why is "none of the above" the wrong answer?