May 17, 2026, 11:40 PM

2026-05-18 06:40:19 +00:00
commit 64944cf004
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+
+---------------------------------------------------------------------------------------------------------------------------
+-- Purpose: This query will find indexes with duplicate columns. Run this in the user database.
+-- More Information: https://www.mssqltips.com/sqlservertip/3604/identify-sql-server-indexes-with-duplicate-columns/
+-- Revision: 2019-05-21
+--
+SELECT t1.tablename, t1.indexname ,t1.columnlist, t2.indexname, t2.columnlist 
+FROM
+   (SELECT 
+      DISTINCT object_name(i.object_id) tablename, 
+      i.name indexname,
+      (SELECT DISTINCT STUFF( (SELECT ', ' + c.name
+                               FROM sys.index_columns ic1 
+                               INNER JOIN sys.columns c ON ic1.object_id=c.object_id AND ic1.column_id=c.column_id
+                               WHERE 
+                                     ic1.index_id = ic.index_id 
+                                 AND ic1.object_id=i.object_id
+                                 AND ic1.index_id=i.index_id
+                               ORDER BY index_column_id FOR XML PATH('')
+                              ),1,2,'')
+       FROM sys.index_columns ic 
+       WHERE object_id=i.object_id AND index_id=i.index_id
+     ) as columnlist
+   FROM sys.indexes i 
+   INNER JOIN sys.index_columns ic ON i.object_id=ic.object_id AND i.index_id=ic.index_id 
+   INNER JOIN sys.objects o ON i.object_id=o.object_id 
+   WHERE o.is_ms_shipped=0) t1 
+INNER JOIN 
+   (SELECT 
+      DISTINCT object_name(i.object_id) tablename,
+      i.name indexname,
+     (SELECT DISTINCT STUFF( (SELECT ', ' + c.name
+                              FROM sys.index_columns ic1 
+                              INNER JOIN sys.columns c ON ic1.object_id=c.object_id AND ic1.column_id=c.column_id
+                              WHERE 
+                                    ic1.index_id = ic.index_id 
+                                AND ic1.object_id=i.object_id 
+                                AND ic1.index_id=i.index_id
+                              ORDER BY index_column_id FOR XML PATH('')
+                             ),1,2,'')
+      FROM sys.index_columns ic 
+      WHERE object_id=i.object_id AND index_id=i.index_id
+     ) as columnlist
+    FROM sys.indexes i 
+    INNER JOIN sys.index_columns ic ON i.object_id=ic.object_id AND i.index_id=ic.index_id 
+    INNER JOIN sys.objects o ON i.object_id=o.object_id 
+    WHERE o.is_ms_shipped=0) t2 
+ ON t1.tablename=t2.tablename 
+AND substring(t2.columnlist,1,len(t1.columnlist))=t1.columnlist 
+AND (t1.columnlist<>t2.columnlist or (t1.columnlist=t2.columnlist AND t1.indexname<>t2.indexname))