alterSequenceComment

Last updated: February 2, 2026

Sets or removes the comment on an existing sequence in Snowflake.

Note: This change type does not support automatic rollback or database inspection features (snapshot, diff, diff-changelog, and generate-changelog commands).

Available attributes

Attribute	Type	Description	Required
`catalogName`	String	Name of the catalog (database) containing the sequence	No
`schemaName`	String	Name of the schema containing the sequence	No
`sequenceName`	String	Name of the sequence to alter	Yes
`ifExists`	Boolean	Don't error if the sequence doesn't exist	No
`newComment`	String	New comment text to set*	No
`unsetComment`	Boolean	Remove the existing comment*	No

* Exactly one of newComment or unsetComment must be specified.

<?xml version="1.0" encoding="UTF-8"?>
<databaseChangeLog
        xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
        xmlns:pro-snowflake="http://www.liquibase.org/xml/ns/pro-snowflake"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
        http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-latest.xsd
        http://www.liquibase.org/xml/ns/pro-snowflake
        http://www.liquibase.org/xml/ns/pro-snowflake/liquibase-pro-snowflake-latest.xsd">

    <!-- Set comment -->
    <changeSet id="set-sequence-comment" author="examples">
        <pro-snowflake:alterSequenceComment
                sequenceName="ORDER_ID_SEQ"
                newComment="Generates unique order IDs"/>
    </changeSet>

    <!-- Set comment with IF EXISTS -->
    <changeSet id="set-comment-if-exists" author="examples">
        <pro-snowflake:alterSequenceComment
                sequenceName="INVOICE_SEQ"
                ifExists="true"
                newComment="Invoice number generator - updated"/>
    </changeSet>

    <!-- Unset comment -->
    <changeSet id="unset-sequence-comment" author="examples">
        <pro-snowflake:alterSequenceComment
                sequenceName="TEMP_SEQ"
                unsetComment="true"/>
    </changeSet>

</databaseChangeLog>

{
  "databaseChangeLog": [
    {
      "changeSet": {
        "id": "set-sequence-comment",
        "author": "examples",
        "changes": [
          {
            "alterSequenceComment": {
              "sequenceName": "ORDER_ID_SEQ",
              "newComment": "Generates unique order IDs"
            }
          }
        ]
      }
    },
    {
      "changeSet": {
        "id": "set-comment-if-exists",
        "author": "examples",
        "changes": [
          {
            "alterSequenceComment": {
              "sequenceName": "INVOICE_SEQ",
              "ifExists": true,
              "newComment": "Invoice number generator - updated"
            }
          }
        ]
      }
    },
    {
      "changeSet": {
        "id": "unset-sequence-comment",
        "author": "examples",
        "changes": [
          {
            "alterSequenceComment": {
              "sequenceName": "TEMP_SEQ",
              "unsetComment": true
            }
          }
        ]
      }
    }
  ]
}

databaseChangeLog:
  # Set comment
  - changeSet:
      id: set-sequence-comment
      author: examples
      changes:
        - alterSequenceComment:
            sequenceName: ORDER_ID_SEQ
            newComment: Generates unique order IDs

  # Set comment with IF EXISTS
  - changeSet:
      id: set-comment-if-exists
      author: examples
      changes:
        - alterSequenceComment:
            sequenceName: INVOICE_SEQ
            ifExists: true
            newComment: Invoice number generator - updated

  # Unset comment
  - changeSet:
      id: unset-sequence-comment
      author: examples
      changes:
        - alterSequenceComment:
            sequenceName: TEMP_SEQ
            unsetComment: true

--liquibase formatted sql

--changeset examples:set-comment
-- Set comment
ALTER SEQUENCE PUBLIC.ORDER_ID_SEQ SET COMMENT = 'Generates unique order IDs';

--changeset examples:set-comment-with-if-exists
-- Set comment with IF EXISTS
ALTER SEQUENCE IF EXISTS PUBLIC.INVOICE_SEQ SET COMMENT = 'Invoice number generator - updated';

--changeset examples:unset-comment
-- Unset comment
ALTER SEQUENCE PUBLIC.TEMP_SEQ UNSET COMMENT;

<?xml version="1.0" encoding="UTF-8"?>
<databaseChangeLog
        xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
        xmlns:pro-snowflake="http://www.liquibase.org/xml/ns/pro-snowflake"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
        http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-latest.xsd
        http://www.liquibase.org/xml/ns/pro-snowflake
        http://www.liquibase.org/xml/ns/pro-snowflake/liquibase-pro-snowflake-latest.xsd">

    <!-- Set comment -->
    <changeSet id="set-sequence-comment" author="examples">
        <pro-snowflake:alterSequenceComment
                sequenceName="ORDER_ID_SEQ"
                newComment="Generates unique order IDs"/>
    </changeSet>

    <!-- Set comment with IF EXISTS -->
    <changeSet id="set-comment-if-exists" author="examples">
        <pro-snowflake:alterSequenceComment
                sequenceName="INVOICE_SEQ"
                ifExists="true"
                newComment="Invoice number generator - updated"/>
    </changeSet>

    <!-- Unset comment -->
    <changeSet id="unset-sequence-comment" author="examples">
        <pro-snowflake:alterSequenceComment
                sequenceName="TEMP_SEQ"
                unsetComment="true"/>
    </changeSet>

</databaseChangeLog>

{
  "databaseChangeLog": [
    {
      "changeSet": {
        "id": "set-sequence-comment",
        "author": "examples",
        "changes": [
          {
            "alterSequenceComment": {
              "sequenceName": "ORDER_ID_SEQ",
              "newComment": "Generates unique order IDs"
            }
          }
        ]
      }
    },
    {
      "changeSet": {
        "id": "set-comment-if-exists",
        "author": "examples",
        "changes": [
          {
            "alterSequenceComment": {
              "sequenceName": "INVOICE_SEQ",
              "ifExists": true,
              "newComment": "Invoice number generator - updated"
            }
          }
        ]
      }
    },
    {
      "changeSet": {
        "id": "unset-sequence-comment",
        "author": "examples",
        "changes": [
          {
            "alterSequenceComment": {
              "sequenceName": "TEMP_SEQ",
              "unsetComment": true
            }
          }
        ]
      }
    }
  ]
}

databaseChangeLog:
  # Set comment
  - changeSet:
      id: set-sequence-comment
      author: examples
      changes:
        - alterSequenceComment:
            sequenceName: ORDER_ID_SEQ
            newComment: Generates unique order IDs

  # Set comment with IF EXISTS
  - changeSet:
      id: set-comment-if-exists
      author: examples
      changes:
        - alterSequenceComment:
            sequenceName: INVOICE_SEQ
            ifExists: true
            newComment: Invoice number generator - updated

  # Unset comment
  - changeSet:
      id: unset-sequence-comment
      author: examples
      changes:
        - alterSequenceComment:
            sequenceName: TEMP_SEQ
            unsetComment: true

--liquibase formatted sql

--changeset examples:set-comment
-- Set comment
ALTER SEQUENCE PUBLIC.ORDER_ID_SEQ SET COMMENT = 'Generates unique order IDs';

--changeset examples:set-comment-with-if-exists
-- Set comment with IF EXISTS
ALTER SEQUENCE IF EXISTS PUBLIC.INVOICE_SEQ SET COMMENT = 'Invoice number generator - updated';

--changeset examples:unset-comment
-- Unset comment
ALTER SEQUENCE PUBLIC.TEMP_SEQ UNSET COMMENT;

alterSequenceComment

Available attributes

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