sql interview questions and answers delete remove duplicate rows records using cte

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sql interview questions and answers delete remove duplicate rows records using cte

To remove duplicate rows in SQL using a Common Table Expression (CTE), a two-step process is employed. First, the CTE is used to identify duplicate rows by assigning row numbers based on specified criteria. Next, the DELETE statement removes duplicates by keeping only rows with row numbers equal to 1, effectively retaining distinct records. This method helps maintain data integrity by eliminating redundancy. The CTE serves as a temporary result set, facilitating a cleaner and more organized approach to handling duplicate records in SQL databases.

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