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