indexing - Alter Non Clustered Index in SQL Server to Add more included columns -


is possible alter existing non clustered index include more columns part of covered columns.

e.g. 

alter index ix_nc_tablename_columnname tablename(columnname) include(col1, col2, col3)

want include col4 in above index.

what impact of adding column? there fragmentation or else?

the cost of additional included column increased storage , potentially fragmentation. fragmentation increase compared old index due increased leaf node size (assuming keys not incremental) , if updates new included column increases length.

consider using create index...with drop existing task. avoid dropping old index , avoid sort, leverage existing index key sequence rebuild:

create index ix_nc_tablename_columnname on tablename(columnname) include(col1, col2, col3, col4) with(drop_existing = on);

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