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-- Purpose: This query will list all indexes in the database and show index columns and included columns using STRING_AGG (SQL 2017 and later). Run this in the user database.
-- More Information: 
-- Revision: 2019-05-21
--
SELECT 
   SCHEMA_NAME(ss.SCHEMA_id) AS SCHEMANAME,
   ss.name as TableName, 
   ss2.name as IndexName, 
   ss2.index_id,
   (SELECT STRING_AGG(name,', ') 
    FROM sys.index_columns a INNER JOIN sys.all_columns b ON a.object_id = b.object_id and a.column_id = b.column_id and a.object_id = ss.object_id and a.index_id = ss2.index_id and is_included_column = 0
   ) as IndexColumns,
   (SELECT STRING_AGG(name,', ') 
    FROM sys.index_columns a INNER JOIN sys.all_columns b ON a.object_id = b.object_id and a.column_id = b.column_id and a.object_id = ss.object_id and a.index_id = ss2.index_id and is_included_column = 1
   ) as IncludedColumns
FROM sys.objects SS INNER JOIN sys.indexes ss2 ON ss.OBJECT_ID = ss2.OBJECT_ID 
WHERE ss.type = 'U'
ORDER BY 1, 2, 3