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Important

The SingleStore 9.1 release candidate (RC) is available now. It will be promoted to general availability (GA) soon and at that time it will be renamed to SingleStore 10.

In the interim, SingleStore 9.1 RC can be used to preview, evaluate, and provide feedback on the new and upcoming features in SingleStore 10, while SingleStore 9.0 is recommended for production workloads.

SUBSTRING_INDEX

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The SUBSTRING_INDEX() function extracts the portion of a string up to the given number of occurrences of a delimiter.

This is mainly useful for delimited strings, such as a CSV or ASCII table. If the count argument is negative, the delimiters will be counted starting from the right, and the portion of the string to the right of the final delimiter will be returned.

Syntax

SUBSTRING_INDEX(str, delimiter, count)

Arguments

  • str: any string or binary object

  • delimiter: the field delimiter

  • count: the number of fields to extract

Return Type

String

Examples

SELECT SUBSTRING_INDEX('a b c d', ' ', 3);
+------------------------------------+
| SUBSTRING_INDEX('a b c d', ' ', 3) |
+------------------------------------+
| a b c                              |
+------------------------------------+
SELECT SUBSTRING_INDEX('de305d54-75b4-431b-adb2-eb613', '-', 2) as uuid;
+---------------+
| uuid          |
+---------------+
| de305d54-75b4 |
+---------------+
SELECT SUBSTRING_INDEX('01-23-45-67-89', '-', -2);
+--------------------------------------------+
| SUBSTRING_INDEX('01-23-45-67-89', '-', -2) |
+--------------------------------------------+
| 67-89                                      |
+--------------------------------------------+

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Verification instructions

Note: You must install cosign to verify the authenticity of the SingleStore file.

Use the following steps to verify the authenticity of singlestoredb-server, singlestoredb-toolbox, singlestoredb-studio, and singlestore-client SingleStore files that have been downloaded.

You may perform the following steps on any computer that can run cosign, such as the main deployment host of the cluster.

  1. (Optional) Run the following command to view the associated signature files.

    curl undefined

  2. Download the signature file from the SingleStore release server.

    • Option 1: Click the Download Signature button next to the SingleStore file.

    • Option 2: Copy and paste the following URL into the address bar of your browser and save the signature file.

    • Option 3: Run the following command to download the signature file.

      curl -O undefined

  3. After the signature file has been downloaded, run the following command to verify the authenticity of the SingleStore file.

    echo -n undefined |
        cosign verify-blob --certificate-oidc-issuer https://oidc.eks.us-east-1.amazonaws.com/id/CCDCDBA1379A5596AB5B2E46DCA385BC \
          --certificate-identity https://kubernetes.io/namespaces/freya-production/serviceaccounts/job-worker \
          --bundle undefined \
          --new-bundle-format -
    Verified OK

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