Convert(int,sys.fn_sqlvarbasetostr(hashbytes('md5','1455985476'))) -

The SQL expression you provided is a specific method used in SQL Server to generate a or "sharding key" from a string value (in this case, the string '1455985476' ). Breaking Down the Code

: 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 The SQL expression you provided is a specific

: Distributing data rows into different "buckets" or shards by hashing a unique ID. SQL Server typically truncates the value