What does HRESULT 0x8004161A (QUERY_E_TOP_LEVEL_IN_GROUP) mean?

QUERY_E_TOP_LEVEL_IN_GROUP

QUERY_E_TOP_LEVEL_IN_GROUP is a hierarchy error in GROUP ON ... OVER. ORDER IN GROUP customizes ordering for a named group within a parent grouping level; the top-level group has no parent group and therefore cannot use that form.

Move group-specific ordering to a nested grouping level

• Print the generated grouping tree with nesting levels rather than inspecting the SQL as one line.
• At the top level, use the supported ORDER BY rules for groups.
• Use ORDER IN GROUP only where the named group exists inside an enclosing group result.

Windows Search grouping returns a hierarchical rowset and supports nested GROUP ON statements. Microsoft distinguishes default group ordering, ORDER BY, and ORDER IN GROUP BY for applying different ordering rules to particular groups. A generic tree-to-SQL serializer should validate the parent relationship before emitting the group-specific clause.

GROUP ON ... OVER · Windows Search SQL overview · Legacy query errors

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