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Asked by heyday2004 in PL / SQL, Oracle 9.x
I have a query listed below:
1.
select priority_level, ID from product order by priority_level, ID DESC
The result will be:
priority_level ID
9 20086750
93 20086845
100 20087773
100 20086884
100 20086843
2. select priority_level, ID from product order by priority_level, ID ASC
priority_level ID
9 20086750
93 20086845
100 20086843
100 20086884
100 20087773
3.
select priority_level, ID from product order by priority_level DESC
priority_level ID
100 20087773
100 20086843
100 20086884
93 20086845
9 20086750
Why the resultset of case 1 and case 2 are the same for DESC and ASC? After removing "order by ID", like case 3, then I get the order I want. Could someone explain this? What's wrong with order by priority_level, ID together? Thanks.
20091111-EE-VQP-89 - Hierarchy / EE_QW_3_20080625