SQL SERVER: Find all non-clustered pks with a clustered index

FindNonCluteredPKsWithClusteredIndex.sql

/* ============================================================================
   Find tables where the primary key is NONCLUSTERED but the table has a
   separate CLUSTERED index (i.e. the clustering key is something other than
   the PK).

   For each matching table, returns:
     - schema and table name
     - the PK index name, its key columns, and any included columns
     - the clustered index name, its key columns, and any included columns
       (note: clustered indexes don't support INCLUDE at DDL time, so the
       clustered_included_columns column will normally be empty)

   Useful for auditing index design — sometimes a non-PK clustered key is
   intentional (e.g. clustering on a date for range scans) and sometimes
   it's a leftover that should be revisited.
   ============================================================================ */
SELECT
    SCHEMA_NAME(t.schema_id)                                  AS schema_name,
    t.name                                                    AS table_name,

    pk.name                                                   AS pk_index_name,
    STUFF((
        SELECT ', ' + c.name
        FROM sys.index_columns ic
        JOIN sys.columns c
          ON c.object_id = ic.object_id AND c.column_id = ic.column_id
        WHERE ic.object_id = pk.object_id
          AND ic.index_id  = pk.index_id
          AND ic.is_included_column = 0
        ORDER BY ic.key_ordinal
        FOR XML PATH('')), 1, 2, '')                          AS pk_key_columns,
    STUFF((
        SELECT ', ' + c.name
        FROM sys.index_columns ic
        JOIN sys.columns c
          ON c.object_id = ic.object_id AND c.column_id = ic.column_id
        WHERE ic.object_id = pk.object_id
          AND ic.index_id  = pk.index_id
          AND ic.is_included_column = 1
        ORDER BY ic.index_column_id
        FOR XML PATH('')), 1, 2, '')                          AS pk_included_columns,

    ci.name                                                   AS clustered_index_name,
    STUFF((
        SELECT ', ' + c.name
        FROM sys.index_columns ic
        JOIN sys.columns c
          ON c.object_id = ic.object_id AND c.column_id = ic.column_id
        WHERE ic.object_id = ci.object_id
          AND ic.index_id  = ci.index_id
          AND ic.is_included_column = 0
        ORDER BY ic.key_ordinal
        FOR XML PATH('')), 1, 2, '')                          AS clustered_key_columns,
    STUFF((
        SELECT ', ' + c.name
        FROM sys.index_columns ic
        JOIN sys.columns c
          ON c.object_id = ic.object_id AND c.column_id = ic.column_id
        WHERE ic.object_id = ci.object_id
          AND ic.index_id  = ci.index_id
          AND ic.is_included_column = 1
        ORDER BY ic.index_column_id
        FOR XML PATH('')), 1, 2, '')                          AS clustered_included_columns
FROM sys.tables AS t
INNER JOIN sys.indexes AS pk
    ON pk.object_id      = t.object_id
   AND pk.is_primary_key = 1
   AND pk.type_desc      = 'NONCLUSTERED'
INNER JOIN sys.indexes AS ci
    ON ci.object_id      = t.object_id
   AND ci.type_desc      = 'CLUSTERED'
   AND ci.is_primary_key = 0
ORDER BY schema_name, table_name;