Sign inTry Free

JSON_LENGTH

On this page

Computes the length of a JSON map or array.

JSON_LENGTH(json)

Arguments

  • json: a valid JSON array or map.

Return Value

  • the length as an integer.

  • SQL NULL if json is not a valid JSON array or map.

Examples

SELECT JSON_LENGTH('true');
+---------------------+
| JSON_LENGTH('true') |
+---------------------+
|                NULL |
+---------------------+
SELECT JSON_LENGTH('[1,2,3]');
+------------------------+
| JSON_LENGTH('[1,2,3]') |
+------------------------+
|                      3 |
+------------------------+
SELECT JSON_LENGTH('{"alpha": 1, "beta": 2}');
+----------------------------------------+
| JSON_LENGTH('{"alpha": 1, "beta": 2}') |
+----------------------------------------+
|                                      2 |
+----------------------------------------+

Note

A JSON or Javascript null value is distinct from SQL NULL.

Last modified: April 4, 2023

Was this article helpful?

On this page

Was this article helpful?

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