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GoogleSQL for BigQuery supports the following hash functions.
Function list
| Name | Summary |
|---|---|
FARM_FINGERPRINT
|
Computes the fingerprint of a STRING or
BYTES value, using the FarmHash Fingerprint64 algorithm.
|
MD5
|
Computes the hash of a STRING or
BYTES value, using the MD5 algorithm.
|
SHA1
|
Computes the hash of a STRING or
BYTES value, using the SHA-1 algorithm.
|
SHA256
|
Computes the hash of a STRING or
BYTES value, using the SHA-256 algorithm.
|
SHA512
|
Computes the hash of a STRING or
BYTES value, using the SHA-512 algorithm.
|
FARM_FINGERPRINT
FARM_FINGERPRINT(value)
Description
Computes the fingerprint of the STRING or BYTES input using the
Fingerprint64 function from the
open-source FarmHash library. The output
of this function for a particular input will never change.
Return type
INT64
Examples
WITH example AS (
SELECT 1 AS x, "foo" AS y, true AS z UNION ALL
SELECT 2 AS x, "apple" AS y, false AS z UNION ALL
SELECT 3 AS x, "" AS y, true AS z
)
SELECT
*,
FARM_FINGERPRINT(CONCAT(CAST(x AS STRING), y, CAST(z AS STRING)))
AS row_fingerprint
FROM example;
/*---+-------+-------+----------------------+
| x | y | z | row_fingerprint |
+---+-------+-------+----------------------+
| 1 | foo | true | -1541654101129638711 |
| 2 | apple | false | 2794438866806483259 |
| 3 | | true | -4880158226897771312 |
+---+-------+-------+----------------------*/
MD5
MD5(input)
Description
Computes the hash of the input using the
MD5 algorithm. The input can either be
STRING or BYTES. The string version treats the input as an array of bytes.
This function returns 16 bytes.
Warning: MD5 is no longer considered secure. For increased security use another hashing function.Return type
BYTES
Example
SELECT MD5("Hello World") as md5;
-- Note that the result of MD5 is of type BYTES, displayed as a base64-encoded string.
/*--------------------------+
| md5 |
+--------------------------+
| sQqNsWTgdUEFt6mb5y4/5Q== |
+--------------------------*/
SHA1
SHA1(input)
Description
Computes the hash of the input using the
SHA-1 algorithm. The input can either be
STRING or BYTES. The string version treats the input as an array of bytes.
This function returns 20 bytes.
Warning: SHA1 is no longer considered secure. For increased security, use another hashing function.Return type
BYTES
Example
SELECT SHA1("Hello World") as sha1;
-- Note that the result of SHA1 is of type BYTES, displayed as a base64-encoded string.
/*------------------------------+
| sha1 |
+------------------------------+
| Ck1VqNd45QIvq3AZd8XYQLvEhtA= |
+------------------------------*/
SHA256
SHA256(input)
Description
Computes the hash of the input using the
SHA-256 algorithm. The input can either be
STRING or BYTES. The string version treats the input as an array of bytes.
This function returns 32 bytes.
Return type
BYTES
Example
SELECT SHA256("Hello World") as sha256;
SHA512
SHA512(input)
Description
Computes the hash of the input using the
SHA-512 algorithm. The input can either be
STRING or BYTES. The string version treats the input as an array of bytes.
This function returns 64 bytes.
Return type
BYTES
Example
SELECT SHA512("Hello World") as sha512;