{
  "id": "tdigest.add",
  "title": "TDIGEST.ADD",
  "url": "https://redis.io/docs/latest/commands/tdigest.add/",
  "summary": "Adds one or more observations to a t-digest sketch",
  "tags": [
    "docs",
    "develop",
    "stack",
    "oss",
    "rs",
    "rc",
    "oss",
    "kubernetes",
    "clients"
  ],
  "last_updated": "2026-04-09T10:29:34-04:00",
  "page_type": "content",
  "content_hash": "3f627a813e15d765815e7b7b20e616266999e683f173ed9dd2033d2546bd1447",
  "sections": [
    {
      "id": "overview",
      "title": "Overview",
      "role": "overview",
      "text": "Adds one or more observations to a t-digest sketch."
    },
    {
      "id": "required-arguments",
      "title": "Required arguments",
      "role": "content",
      "text": "<details open><summary><code>key</code></summary> \n\nis the key name for an existing t-digest sketch.\n</details>\n\n<details open><summary><code>value</code></summary> \n\nis the floating-point value of an observation.\n</details>"
    },
    {
      "id": "examples",
      "title": "Examples",
      "role": "example",
      "text": "redis> TDIGEST.ADD t 1 2 3\nOK\n\n\n\nredis> TDIGEST.ADD t string\n(error) ERR T-Digest: error parsing val parameter"
    },
    {
      "id": "redis-software-and-redis-cloud-compatibility",
      "title": "Redis Software and Redis Cloud compatibility",
      "role": "content",
      "text": "| Redis<br />Software | Redis<br />Cloud | <span style=\"min-width: 9em; display: table-cell\">Notes</span> |\n|:----------------------|:-----------------|:------|\n| <span title=\"Supported\">&#x2705; Supported</span><br /> | <span title=\"Supported\"><nobr>&#x2705; Flexible & Annual</nobr></span><br /><span title=\"Supported\">&#x2705; Free & Fixed</nobr></span> |  |"
    },
    {
      "id": "return-information",
      "title": "Return information",
      "role": "returns",
      "text": "**RESP2:**\n\nOne of the following:\n\n* [Simple string reply]() `OK` if executed correctly.\n* [Simple error reply]() in these cases: the given key does not exist or the value parameter is of the incorrect type.\n\n**RESP3:**\n\nOne of the following:\n\n* [Simple string reply]() `OK` if executed correctly.\n* [Simple error reply]() in these cases: the given key does not exist or the value parameter is of the incorrect type."
    }
  ],
  "examples": []
}