What are the differences between “row_number()”, “rank()” and “dense_rank()”?
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Answer Posted / Sandeep Kumar Shukla
Row_number() assigns a unique number to each row in a result set, regardless of any duplicates. Rank() assigns a rank to each distinct value, with ties assigned the same rank and a sequence number added to distinguish them. Dense_rank() is similar to rank(), but it does not have gaps in the sequence numbers when there are ties.
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