List unique indexes in SQL Server database

Query below lists all unique indexes in the database.

Check out also list of unique constraints.


select i.[name] as index_name,
    substring(column_names, 1, len(column_names)-1) as [columns],
    case when i.[type] = 1 then 'Clustered unique index'
        when i.type = 2 then 'Unique index'
        end as index_type,
    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],
    case when c.[type] = 'PK' then 'Primary key'
        when c.[type] = 'UQ' then 'Unique constraint'
        end as constraint_type, 
    c.[name] as constraint_name
from sys.objects t
    left outer join sys.indexes i
        on t.object_id = i.object_id
    left outer join sys.key_constraints c
        on i.object_id = c.parent_object_id 
        and i.index_id = c.unique_index_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 col.column_id
                            for xml path ('') ) D (column_names)
where is_unique = 1
and t.is_ms_shipped <> 1
order by i.[name]


  • index_name - name of the index
  • columns - index columns separated with ","
  • index_type - type of the index
    • Clustered unique index
    • Unique index - non-clustered unique index
  • table_view - schema and name of table or view
  • object_type - type of object which constraint/index was created on
    • Table
    • View
  • constraint_type -
    • Primary key - for primary keys
    • Unique constraint - for constraints created with CONSTRAINT UNIQUE statement
  • constraint_name - primary/unique key constraint, null for unique indexes without constraints


  • One row represents one index
  • Scope of rows: all unique indexes in the database
  • Ordered by index name

Sample results

Unique indexes in AdventureWorks database:

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