Hi @db042190 ,
Welcome to Microsoft Q&A!
Please refer to these articles to know about how to create a proper index:
https://blog.quest.com/11-sql-server-index-best-practices-for-improved-performance-tuning/
https://www.sqlshack.com/top-five-considerations-for-sql-server-index-design/
Hope these would give you some help.
Best regards,
Seeya
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