SQL 2005 – Script to find missing indexes

SET CONCAT_NULL_YIELDS_NULL OFF
SELECT weighted_cost = avg_total_user_cost * avg_user_impact * (user_seeks + user_scans),
 s.*,
 'CREATE INDEX IX_' +
 REPLACE(REPLACE(COALESCE(equality_columns, inequality_columns), '[', ''), ']', '') +
 ' ON ' + d.statement + '(' + COALESCE(equality_columns, inequality_columns) +
 CASE WHEN equality_columns IS NOT NULL
  THEN
  CASE WHEN inequality_columns IS NOT NULL
   THEN ', ' + inequality_columns                
   END      
  END       + ')' +
  CASE WHEN included_columns IS NOT NULL
   THEN ' INCLUDE (' + included_columns + ')'
  END
FROM    sys.dm_db_missing_index_details d
INNER JOIN sys.dm_db_missing_index_groups g      
 ON d.index_handle = g.index_handle
INNER JOIN sys.dm_db_missing_index_group_stats s      
 ON g.index_group_handle = s.group_handle
ORDER BY avg_total_user_cost * avg_user_impact * (user_seeks + user_scans)DESC;