Hash Functions

Technical Article

Writing New Hash Functions for SQL Server

  • Article

This blog, explores ideas for extending SQL Server with new, fast hash functions. As will be shown, the high speed, built in functions CHECKSUM and BINARY_CHECKSUM are not always optimal hash functions, when you require the function to spread data evenly over an integer space.

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2011-12-28

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Question of the Day

BIT_COUNT() IV

In SQL Server 2025, I run this code:

select bit_count('A')
What is returned?

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