List unique keys and indexes in Azure SQL Database

Rene Castro - Dataedo Team Rene Castro 2018-12-10

Table of Contents:


    The query below returns all primary keys, unique key constraints and unique indexes **on **tables and views in the Azure SQL database.

    Check out also the list of unique keys.

    Query

    select 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'
            when i.[type] = 1 then 'Unique clustered index'
            when i.type = 2 then 'Unique index'
            end as constraint_type,
        c.[name] as constraint_name,
        substring(column_names, 1, len(column_names)-1) as [columns],
        i.[name] as index_name,
        case when i.[type] = 1 then 'Clustered index'
            when i.type = 2 then 'Index'
            end as index_type
    from sys.objects as t
        left outer join sys.indexes as i
            on t.object_id = i.object_id
        left outer join sys.key_constraints as 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 as ic
                        inner join sys.columns as 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 schema_name(t.schema_id) + '.' + t.[name]
    

    Columns

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

    Rows

    • One row: represents one constraint/index in the database. Primary/unique key constraints are implemented in Azure SQL Database as indexes and such pair is represented as one row
    • Scope of rows: all PKs, UKs and unique indexes
    • Ordered by: schema and table/view name

    Sample results

    Primary, unique keys and unique indexes in the AdventureWorksLT database:

    0
    There are no comments. Click here to write the first comment.

    By continuing to use our website, you consent to the use of cookies in accordance with our Privacy Policy.
    Accept