>The order by 2,1 is to sort the resultant data on column 2 in ascending order and then on column1 in ascending order. Actually "ordering" only makes sense on the outermost query -- if you order in a subquery, the outer query is permitted to scramble the results at will, so the subquery ordering does essentially nothing. >If you are getting null, un USED_GB column means, that specific tablespace is empty. no it is not. please send me your mail and i will send you result private
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