找出需要索引的列Find those missing indexes

SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
SELECT TOP 20
ROUND(s.avg_total_user_cost * s.avg_user_impact *
(s.user_seeks + s.user_scans),0) AS [Total Cost]
, s.avg_user_impact
, d.statement AS TableName
, d.equality_columns
, d.inequality_columns
, d.included_columns
FROM sys.dm_db_missing_index_groups g
INNER JOIN sys.dm_db_missing_index_group_stats s
ON s.group_handle = g.index_group_handle
INNER JOIN sys.dm_db_missing_index_details d
ON d.index_handle = g.index_handle
ORDER BY [Total Cost] DESC