Compute
Elastic Cloud Server
Huawei Cloud Flexus
Bare Metal Server
Auto Scaling
Image Management Service
Dedicated Host
FunctionGraph
Cloud Phone Host
Huawei Cloud EulerOS
Networking
Virtual Private Cloud
Elastic IP
Elastic Load Balance
NAT Gateway
Direct Connect
Virtual Private Network
VPC Endpoint
Cloud Connect
Enterprise Router
Enterprise Switch
Global Accelerator
Management & Governance
Cloud Eye
Identity and Access Management
Cloud Trace Service
Resource Formation Service
Tag Management Service
Log Tank Service
Config
OneAccess
Resource Access Manager
Simple Message Notification
Application Performance Management
Application Operations Management
Organizations
Optimization Advisor
IAM Identity Center
Cloud Operations Center
Resource Governance Center
Migration
Server Migration Service
Object Storage Migration Service
Cloud Data Migration
Migration Center
Cloud Ecosystem
KooGallery
Partner Center
User Support
My Account
Billing Center
Cost Center
Resource Center
Enterprise Management
Service Tickets
HUAWEI CLOUD (International) FAQs
ICP Filing
Support Plans
My Credentials
Customer Operation Capabilities
Partner Support Plans
Professional Services
Analytics
MapReduce Service
Data Lake Insight
CloudTable Service
Cloud Search Service
Data Lake Visualization
Data Ingestion Service
GaussDB(DWS)
DataArts Studio
Data Lake Factory
DataArts Lake Formation
IoT
IoT Device Access
Others
Product Pricing Details
System Permissions
Console Quick Start
Common FAQs
Instructions for Associating with a HUAWEI CLOUD Partner
Message Center
Security & Compliance
Security Technologies and Applications
Web Application Firewall
Host Security Service
Cloud Firewall
SecMaster
Anti-DDoS Service
Data Encryption Workshop
Database Security Service
Cloud Bastion Host
Data Security Center
Cloud Certificate Manager
Edge Security
Managed Threat Detection
Blockchain
Blockchain Service
Web3 Node Engine Service
Media Services
Media Processing Center
Video On Demand
Live
SparkRTC
MetaStudio
Storage
Object Storage Service
Elastic Volume Service
Cloud Backup and Recovery
Storage Disaster Recovery Service
Scalable File Service Turbo
Scalable File Service
Volume Backup Service
Cloud Server Backup Service
Data Express Service
Dedicated Distributed Storage Service
Containers
Cloud Container Engine
SoftWare Repository for Container
Application Service Mesh
Ubiquitous Cloud Native Service
Cloud Container Instance
Databases
Relational Database Service
Document Database Service
Data Admin Service
Data Replication Service
GeminiDB
GaussDB
Distributed Database Middleware
Database and Application Migration UGO
TaurusDB
Middleware
Distributed Cache Service
API Gateway
Distributed Message Service for Kafka
Distributed Message Service for RabbitMQ
Distributed Message Service for RocketMQ
Cloud Service Engine
Multi-Site High Availability Service
EventGrid
Dedicated Cloud
Dedicated Computing Cluster
Business Applications
Workspace
ROMA Connect
Message & SMS
Domain Name Service
Edge Data Center Management
Meeting
AI
Face Recognition Service
Graph Engine Service
Content Moderation
Image Recognition
Optical Character Recognition
ModelArts
ImageSearch
Conversational Bot Service
Speech Interaction Service
Huawei HiLens
Video Intelligent Analysis Service
Developer Tools
SDK Developer Guide
API Request Signing Guide
Terraform
Koo Command Line Interface
Content Delivery & Edge Computing
Content Delivery Network
Intelligent EdgeFabric
CloudPond
Intelligent EdgeCloud
Solutions
SAP Cloud
High Performance Computing
Developer Services
ServiceStage
CodeArts
CodeArts PerfTest
CodeArts Req
CodeArts Pipeline
CodeArts Build
CodeArts Deploy
CodeArts Artifact
CodeArts TestPlan
CodeArts Check
CodeArts Repo
Cloud Application Engine
MacroVerse aPaaS
KooMessage
KooPhone
KooDrive

ALTER TYPE

Updated on 2024-10-14 GMT+08:00

Function

ALTER TYPE modifies the definition of a type.

Precautions

Only the type owner or a user granted with the ALTER permission can run the ALTER TYPE command. The system administrator has this permission by default. To modify the owner or schema of a type, you must be a type owner or system administrator and a member of the new owner role.

Syntax

  • Modify a type.
     1
     2
     3
     4
     5
     6
     7
     8
     9
    10
    11
    12
    ALTER TYPE name action [, ... ]
    ALTER TYPE name OWNER TO { new_owner | CURRENT_USER | SESSION_USER }
    ALTER TYPE name RENAME ATTRIBUTE attribute_name TO new_attribute_name [ CASCADE | RESTRICT ]
    ALTER TYPE name RENAME TO new_name
    ALTER TYPE name SET SCHEMA new_schema
    ALTER TYPE name ADD VALUE [ IF NOT EXISTS ] new_enum_value [ { BEFORE | AFTER } neighbor_enum_value ] 
    ALTER TYPE name RENAME VALUE existing_enum_value TO new_enum_value
    
    where action is one of:
        ADD ATTRIBUTE attribute_name data_type [ COLLATE collation ] [ CASCADE | RESTRICT ]
        DROP ATTRIBUTE [ IF EXISTS ] attribute_name [ CASCADE | RESTRICT ]
        ALTER ATTRIBUTE attribute_name [ SET DATA ] TYPE data_type [ COLLATE collation ] [ CASCADE | RESTRICT ]
    
  • Add a new attribute to a composite type.
    1
    ALTER TYPE name ADD ATTRIBUTE attribute_name data_type [ COLLATE collation ] [ CASCADE | RESTRICT ]
    
  • Delete an attribute from a composite type.
    1
    ALTER TYPE name DROP ATTRIBUTE [ IF EXISTS ] attribute_name [ CASCADE | RESTRICT ]
    
  • Change the type of an attribute in a composite type.
    1
    ALTER TYPE name ALTER ATTRIBUTE attribute_name [ SET DATA ] TYPE data_type [ COLLATE collation ] [ CASCADE | RESTRICT ]
    
  • Change the owner of a type.
    1
    ALTER TYPE name OWNER TO { new_owner | CURRENT_USER | SESSION_USER }
    
  • Change the name of a type or the name of an attribute in a composite type.
    1
    2
    ALTER TYPE name RENAME TO new_name
    ALTER TYPE name RENAME ATTRIBUTE attribute_name TO new_attribute_name [ CASCADE | RESTRICT ]
    
  • Move a type to a new schema.
    1
    ALTER TYPE name SET SCHEMA new_schema
    
  • Add a new value to an enumerated type.
    1
    ALTER TYPE name ADD VALUE [ IF NOT EXISTS ] new_enum_value [ { BEFORE | AFTER } neighbor_enum_value ]
    
  • Change an enumerated value in the value list.
    1
    ALTER TYPE name RENAME VALUE existing_enum_value TO new_enum_value
    

Parameter Description

  • name

    Specifies the name of an existing type that needs to be modified (optionally schema-qualified).

  • new_name

    Specifies the new name of the type.

  • new_owner

    Specifies the new owner of the type.

  • new_schema

    Specifies the new schema of the type.

  • attribute_name

    Specifies the name of the attribute to be added, modified, or deleted.

  • new_attribute_name

    Specifies the new name of the attribute to be renamed.

  • data_type

    Specifies the data type of the attribute to be added, or the new type of the attribute to be modified.

  • new_enum_value

    Specifies a new enumerated value. It is a non-null string with a maximum length of 64 bytes.

  • neighbor_enum_value

    Specifies an existing enumerated value before or after which a new enumerated value will be added.

  • existing_enum_value

    Specifies an enumerated value to be changed. It is a non-null string with a maximum length of 64 bytes.

  • CASCADE

    Determines that the type to be modified, its associated records, and subtables that inherit the type will all be updated.

  • RESTRICT

    Refuses to update the associated records of the modified type. This is the default action.

    NOTICE:
    • ADD ATTRIBUTE, DROP ATTRIBUTE, and ALTER ATTRIBUTE can be combined for processing. For example, it is possible to add several attributes or change the types of several attributes at the same time in one command.
    • To modify a schema of a type, you must have the CREATE permission on the new schema. To alter the owner, you must be a direct or indirect member of the new owner role, and that member must have CREATE permission on the schema of this type (these restrictions enforce that the alter owner will not do anything that cannot be done by deleting and rebuilding the type). However, the system administrator can modify the rights of any type in any way. To add an attribute or modify the type of an attribute, you must also have the USAGE permission of this type.

Example

See Examples in CREATE TYPE.

Helpful Links

CREATE TYPE and DROP TYPE

We use cookies to improve our site and your experience. By continuing to browse our site you accept our cookie policy. Find out more

Feedback

Feedback

Feedback

0/500

Selected Content

Submit selected content with the feedback