According to official documentation of sys.indexes,
type = 2 -->Nonclustered rowstore (B-tree). But the line 4 of the following example taken from online here is showing
type = 2 -->Nonclustered unique. Question: Does type =2 implies Nonclustered unique index. Why the author is using
unique in line 4 below?
select i.[name] as index_name, substring(column_names, 1, len(column_names)-1) as [columns], case when i.[type] = 1 then 'Clustered index' when i.[type] = 2 then 'Nonclustered unique index' when i.[type] = 3 then 'XML index' when i.[type] = 4 then 'Spatial index' when i.[type] = 5 then 'Clustered columnstore index' when i.[type] = 6 then 'Nonclustered columnstore index' when i.[type] = 7 then 'Nonclustered hash index' end as index_type, case when i.is_unique = 1 then 'Unique' else 'Not unique' end as [unique], schema_name(t.schema_id) + '.' + t.[name] as table_view, case when t.[type] = 'U' then 'Table' when t.[type] = 'V' then 'View' end as [object_type] from sys.objects t inner join sys.indexes i on t.object_id = i.object_id cross apply (select col.[name] + ', ' from sys.index_columns ic inner join sys.columns col on ic.object_id = col.object_id and ic.column_id = col.column_id where ic.object_id = t.object_id and ic.index_id = i.index_id order by key_ordinal for xml path ('') ) D (column_names) where t.is_ms_shipped <> 1 and index_id > 0 order by i.[name]