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Simplistic hash functions may add the first and last n characters of a string along with the length, or form a word-size hash from the middle 4 characters of a string. This saves iterating over the (potentially long) string, but hash functions which do not hash on all characters of a string can readily become linear due to redundancies. The method used is split, it splits up the string and then stores into hash map in correct format. // Defines a Hashmap which will be used in this sample. MapString, String map = new HashMapString, String; /. This String text could vary this could be like 'key1=value1,key2=value2,key3=value3' or could be using any. kind of seperator.
Applies to:SQL Server (all supported versions) Azure SQL DatabaseAzure SQL Managed InstanceAzure Synapse AnalyticsParallel Data Warehouse
See the guide: Strings Hashing Converts each string in the input Tensor to its hash mod by a number of buckets. The hash function is deterministic on the content of the string within the process and will never change. However, it is not suitable for cryptography.
Returns the MD2, MD4, MD5, SHA, SHA1, or SHA2 hash of its input in SQL Server.
Syntax
Note
To view Transact-SQL syntax for SQL Server 2014 and earlier, see Previous versions documentation.
String To Hashmap
Arguments
String To Hash Ruby
Identifies the hashing algorithm to be used to hash the input. This is a required argument with no default. The single quotation marks are required. Beginning with SQL Server 2016 (13.x), all algorithms other than SHA2_256, and SHA2_512 are deprecated.
@input
Specifies a variable containing the data to be hashed. @input is varchar, nvarchar, or varbinary.
'input'
Specifies an expression that evaluates to a character or binary string to be hashed.
The output conforms to the algorithm standard: 128 bits (16 bytes) for MD2, MD4, and MD5; 160 bits (20 bytes) for SHA and SHA1; 256 bits (32 bytes) for SHA2_256, and 512 bits (64 bytes) for SHA2_512.
Applies to: SQL Server 2012 (11.x) and later
Md5 Hash To String
For SQL Server 2014 (12.x) and earlier, allowed input values are limited to 8000 bytes.
Return Value
varbinary (maximum 8000 bytes)
Remarks
Hash To Text
Consider using CHECKSUM or BINARY_CHECKSUM as alternatives to compute a hash value.
The MD2, MD4, MD5, SHA, and SHA1 algorithms are deprecated starting with SQL Server 2016 (13.x). Use SHA2_256 or SHA2_512 instead. Older algorithms will continue working, but they will raise a deprecation event.
Freemarker Convert String To Hash
Examples
Return the hash of a variable
The following example returns the SHA2_256 hash of the nvarchar data stored in variable @HashThis.
Return the hash of a table column
The following example returns the SHA2_256 hash of the values in column c1 in the table Test1.
Here is the result set.
See Also
