Convert(int,sys.fn_sqlvarbasetostr(hashbytes('md5','1455985476'))) 〈Editor's Choice〉

: Distributing data rows into different "buckets" or shards by hashing a unique ID.

: This generates a 128-bit MD5 hash of the input string, returned as a varbinary value. : Distributing data rows into different "buckets" or

: Creating a non-obvious integer ID from a sensitive string. : Selecting a deterministic but seemingly random subset

: Selecting a deterministic but seemingly random subset of rows (e.g., WHERE ABS(HashConvert) % 10 = 0 for a 10% sample). The Result : Using sys

: This attempts to cast that hex string into a 4-byte integer. Because the hash is much larger than an integer, SQL Server typically truncates the value, often resulting in an arithmetic overflow or returning a signed integer based on the last 4 bytes of the hash. The Result

: Using sys.fn_sqlvarbasetostr is generally discouraged in production code because it is an undocumented internal function. A more standard approach in T-SQL is CONVERT(INT, HashBytes('MD5', '...'), 2) or directly casting the binary to an integer.