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GoogleSQL for Spanner supports the following hash functions.
Function list Name SummaryFARM_FINGERPRINT Computes the fingerprint of a STRING or BYTES value, using the FarmHash Fingerprint64 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 |
*---+-------+-------+----------------------*/
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;
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-07 UTC.
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