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doc: list of hashing algorithms supported by DBs #128

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doc: list of hashing algorithms supported by DBs #128

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21 changes: 21 additions & 0 deletions README.md
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Expand Up @@ -135,6 +135,18 @@ $ data-diff \
If a database is not on the list, we'd still love to support it. Open an issue
to discuss it.

##### Hashing Algorithms supported by databases

| Database | Supported algorithms | Resources |
|---------------|---------------------------------------------|--------------------------------------------------|
| PostgreSQL | MD5, SHA224, SHA256, SHA384, SHA512 | [Doc][PSQL_Doc] |
| MSSQL | MD2, MD4, MD5, SHA, SHA1 | [Perf][MSSQL_Perf] |
| Snowflake | Hash/Hash_Agg, MD5, SHA1, SHA2 | [Doc][Snowflake_Doc] |
| Oracle | MD5, SHA1, SHA256, SHA384, SHA512 | [Reference][Oracle_Doc], [Perf][Oracle_Perf] |
| BigQuery | MD5, SHA1, SHA256, SHA512, FARM_FINGERPRINT | [Doc][BigQuery_Doc] |
| Redshift | MD5, SHA, SHA1, SHA2, FARM_FINGERPRINT | [Doc][Redshift_Doc] |
| Presto | MD5, SHA1, SHA256, SHA512 | [Doc][Presto_Doc] |

# How to install

Requires Python 3.7+ with pip.
Expand Down Expand Up @@ -465,3 +477,12 @@ poetry run python3 -m data_diff postgresql://postgres:Password1@localhost/postgr
[tech-explain]: #technical-explanation
[perf]: #performance-considerations
[slack]: https://locallyoptimistic.com/community/

[PSQL_Doc]: <https://www.postgresql.org/docs/11/functions-binarystring.html>
[MSSQL_Perf]: <https://www.postgresql.org/docs/11/functions-binarystring.html>
[Snowflake_Doc]: <https://docs.snowflake.com/en/sql-reference/functions-string.html>
[Oracle_Doc]: <https://dbalifeeasy.com/2019/05/06/cryptographic-hash-functions-in-oracle/>
[Oracle_Perf]: <https://danischnider.wordpress.com/2017/01/24/how-to-build-hash-keys-in-oracle/>
[BigQuery_Doc]: <https://cloud.google.com/bigquery/docs/reference/standard-sql/hash_functions>
[Redshift_Doc]: <https://docs.aws.amazon.com/redshift/latest/dg/hash-functions.html>
[Presto_Doc]: <https://teradata.github.io/presto/docs/141t/functions/binary.html>