- Release Notes and Announcements
- Release Notes
- Announcements
- Announcement on Release of New Upgrade Mechanism for Kernel Minor Version
- Announcement on Optimization of Instance Storage Capacity, IOPS, and I/O Bandwidth
- Announcement on Some APIs with CAM Authentication Integrated
- Announcement on Sales Suspension of Some General Specifications
- Announcement on Some APIs Integrated with CAM Authentication
- Announcement on Some APIs with CAM Authentication Integrated
- Announcement on Change of Part of Parameters
- Announcement on Update of Database Audit Feature
- Announcement on Authentication of a Newly Added API Interface of Database Audit
- Announcement on Change of Public Network Linkage
- TDSQL-C for MySQL Audit Service Update
- Announcement on Supplementary Charge for Clusters with Pay-as-You-Go Storage Billing Mode
- Announcement on New APIs Integrated with CAM Permissions
- Announcement on the Release of New Version of Database Proxy
- Emergency Fix for Certain Monitoring Metrics
- Monitoring Metric Optimization
- Change to Database Audit Resource ID
- Ops Change
- Storage Price Adjustment Notification
- Beginner's Guide
- Product Introduction
- Kernel Features
- Kernel Overview
- Kernel Version Release Notes
- Optimized Kernel Version
- Functionality Features
- Performance Features
- Columns Syntax
- Correlated Subquery Result Cache
- Global Index
- Binlog Write Optimization
- Large Transaction Binlog Optimization
- Binlog Purging Performance Optimization
- Optimization of Plan Caching Point Query
- Auto-Increment Column Persistence
- Invisible Index
- Computation Pushdown
- Parallel Initialization of InnoDB Buffer Pool
- Security Features
- Stability Feature
- Analysis Engine Features
- Purchase Guide
- Getting Started
- Database Audit
- Serverless Service
- Operation Guide
- Switching Cluster Page View in Console
- Database Connection
- Instance Management
- Configuration Adjustment
- Cluster Management
- Scaling Instance
- Database Proxy
- Database Proxy Overview
- Use Limits
- Database Proxy Kernel Features
- Managing Database Proxy
- Enabling Database Proxy
- Setting Database Proxy Address
- Modifying or Deleting Connection Addresses
- Viewing and Changing the Access Policy
- Rebalancing the Load
- Transaction Split Feature
- Momentary Disconnection Prevention Feature
- Access Mode
- Adjusting Database Proxy Configuration
- Switching Database Proxy Network
- Viewing Database Proxy Monitoring Data
- Disabling Database Proxy
- Automatic Read/Write Separation
- Connection Pool Feature
- Other Features
- Account Management
- Database Management
- Database Management Tool
- Columnar Storage Index (CSI)
- Read-Only Analysis Engine
- Overview
- Feature Limits and Compatibility
- Compatibility and Use Limits
- Data Loading Limitations
- Description of Functions and Operators
- Description of Supported Bitwise Operations
- Description of Supported Arithmetic
- Description of Supported Comparison Operations
- Description of Supported Logical Operations
- Description of Supported String Functions
- Description of Supported Mathematical Operation Functions
- Description of Supported Date Functions
- Description of Supported Aggregation Functions
- Description of Supported Type Conversion Functions
- Data Types
- Read-Only Analysis Engine Management
- Data Loading
- Executing Queries
- Performance Optimization
- Performance White Paper
- Parameter Configuration
- Multi-AZ Deployment
- Backup and Restoration
- Operation Log
- Data Migration
- Parallel Query
- Database Security and Encryption
- Monitoring and Alarms
- Basic SQL Operations
- Connecting to TDSQL-C for MySQL Through SCF
- Tag
- Practical Tutorial
- Classified Protection Practice for Database Audit of TDSQL-C for MySQL
- Upgrading Database Version from MySQL 5.7 to 8.0 Through DTS
- Usage Instructions for TDSQL-C MySQL
- New Version of Console
- Implementing Multiple RO Groups with Multiple Database Proxy Connection Addresses
- Strengths of Database Proxy
- Selecting Billing Mode for Storage Space
- Creating Remote Disaster Recovery by DTS
- Creating VPC for Cluster
- Data Rollback
- Solution to High CPU Utilization
- How to Authorize Sub-Users to View Monitoring Data
- White Paper
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Billing APIs
- Instance APIs
- CloseClusterPasswordComplexity
- CopyClusterPasswordComplexity
- DescribeClusterDetail
- DescribeClusterPasswordComplexity
- ModifyClusterPasswordComplexity
- OpenClusterPasswordComplexity
- UpgradeClusterVersion
- UpgradeInstance
- SetRenewFlag
- OfflineCluster
- ModifyMaintainPeriodConfig
- IsolateInstance
- IsolateCluster
- DescribeMaintainPeriod
- DescribeInstanceSpecs
- DescribeClusters
- CreateClusters
- AddInstances
- OfflineInstance
- DescribeInstanceDetail
- DescribeClusterInstanceGrps
- DescribeInstances
- ActivateInstance
- ModifyInstanceName
- ModifyClusterName
- SearchClusterTables
- SearchClusterDatabases
- RestartInstance
- Multi-AZ APIs
- Account APIs
- Audit APIs
- Database Proxy APIs
- Backup and Restoration APIs
- Parameter Management APIs
- Performance Analysis APIs
- Serverless APIs
- ResourcePackage APIs
- Other APIs
- CloseWan
- CreateClusterDatabase
- DeleteClusterDatabase
- DescribeClusterDetailDatabases
- ModifyClusterDatabase
- OpenWan
- SwitchClusterVpc
- OpenReadOnlyInstanceExclusiveAccess
- OpenClusterReadOnlyInstanceGroupAccess
- ModifyDBInstanceSecurityGroups
- DescribeProjectSecurityGroups
- DescribeDBSecurityGroups
- SwitchProxyVpc
- DescribeFlow
- DescribeZones
- ModifyVipVport
- Data Types
- Error Codes
- FAQs
- Service Agreement
- TDSQL-C Policy
- General References
- Glossary
- Contact Us
- Release Notes and Announcements
- Release Notes
- Announcements
- Announcement on Release of New Upgrade Mechanism for Kernel Minor Version
- Announcement on Optimization of Instance Storage Capacity, IOPS, and I/O Bandwidth
- Announcement on Some APIs with CAM Authentication Integrated
- Announcement on Sales Suspension of Some General Specifications
- Announcement on Some APIs Integrated with CAM Authentication
- Announcement on Some APIs with CAM Authentication Integrated
- Announcement on Change of Part of Parameters
- Announcement on Update of Database Audit Feature
- Announcement on Authentication of a Newly Added API Interface of Database Audit
- Announcement on Change of Public Network Linkage
- TDSQL-C for MySQL Audit Service Update
- Announcement on Supplementary Charge for Clusters with Pay-as-You-Go Storage Billing Mode
- Announcement on New APIs Integrated with CAM Permissions
- Announcement on the Release of New Version of Database Proxy
- Emergency Fix for Certain Monitoring Metrics
- Monitoring Metric Optimization
- Change to Database Audit Resource ID
- Ops Change
- Storage Price Adjustment Notification
- Beginner's Guide
- Product Introduction
- Kernel Features
- Kernel Overview
- Kernel Version Release Notes
- Optimized Kernel Version
- Functionality Features
- Performance Features
- Columns Syntax
- Correlated Subquery Result Cache
- Global Index
- Binlog Write Optimization
- Large Transaction Binlog Optimization
- Binlog Purging Performance Optimization
- Optimization of Plan Caching Point Query
- Auto-Increment Column Persistence
- Invisible Index
- Computation Pushdown
- Parallel Initialization of InnoDB Buffer Pool
- Security Features
- Stability Feature
- Analysis Engine Features
- Purchase Guide
- Getting Started
- Database Audit
- Serverless Service
- Operation Guide
- Switching Cluster Page View in Console
- Database Connection
- Instance Management
- Configuration Adjustment
- Cluster Management
- Scaling Instance
- Database Proxy
- Database Proxy Overview
- Use Limits
- Database Proxy Kernel Features
- Managing Database Proxy
- Enabling Database Proxy
- Setting Database Proxy Address
- Modifying or Deleting Connection Addresses
- Viewing and Changing the Access Policy
- Rebalancing the Load
- Transaction Split Feature
- Momentary Disconnection Prevention Feature
- Access Mode
- Adjusting Database Proxy Configuration
- Switching Database Proxy Network
- Viewing Database Proxy Monitoring Data
- Disabling Database Proxy
- Automatic Read/Write Separation
- Connection Pool Feature
- Other Features
- Account Management
- Database Management
- Database Management Tool
- Columnar Storage Index (CSI)
- Read-Only Analysis Engine
- Overview
- Feature Limits and Compatibility
- Compatibility and Use Limits
- Data Loading Limitations
- Description of Functions and Operators
- Description of Supported Bitwise Operations
- Description of Supported Arithmetic
- Description of Supported Comparison Operations
- Description of Supported Logical Operations
- Description of Supported String Functions
- Description of Supported Mathematical Operation Functions
- Description of Supported Date Functions
- Description of Supported Aggregation Functions
- Description of Supported Type Conversion Functions
- Data Types
- Read-Only Analysis Engine Management
- Data Loading
- Executing Queries
- Performance Optimization
- Performance White Paper
- Parameter Configuration
- Multi-AZ Deployment
- Backup and Restoration
- Operation Log
- Data Migration
- Parallel Query
- Database Security and Encryption
- Monitoring and Alarms
- Basic SQL Operations
- Connecting to TDSQL-C for MySQL Through SCF
- Tag
- Practical Tutorial
- Classified Protection Practice for Database Audit of TDSQL-C for MySQL
- Upgrading Database Version from MySQL 5.7 to 8.0 Through DTS
- Usage Instructions for TDSQL-C MySQL
- New Version of Console
- Implementing Multiple RO Groups with Multiple Database Proxy Connection Addresses
- Strengths of Database Proxy
- Selecting Billing Mode for Storage Space
- Creating Remote Disaster Recovery by DTS
- Creating VPC for Cluster
- Data Rollback
- Solution to High CPU Utilization
- How to Authorize Sub-Users to View Monitoring Data
- White Paper
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Billing APIs
- Instance APIs
- CloseClusterPasswordComplexity
- CopyClusterPasswordComplexity
- DescribeClusterDetail
- DescribeClusterPasswordComplexity
- ModifyClusterPasswordComplexity
- OpenClusterPasswordComplexity
- UpgradeClusterVersion
- UpgradeInstance
- SetRenewFlag
- OfflineCluster
- ModifyMaintainPeriodConfig
- IsolateInstance
- IsolateCluster
- DescribeMaintainPeriod
- DescribeInstanceSpecs
- DescribeClusters
- CreateClusters
- AddInstances
- OfflineInstance
- DescribeInstanceDetail
- DescribeClusterInstanceGrps
- DescribeInstances
- ActivateInstance
- ModifyInstanceName
- ModifyClusterName
- SearchClusterTables
- SearchClusterDatabases
- RestartInstance
- Multi-AZ APIs
- Account APIs
- Audit APIs
- Database Proxy APIs
- Backup and Restoration APIs
- Parameter Management APIs
- Performance Analysis APIs
- Serverless APIs
- ResourcePackage APIs
- Other APIs
- CloseWan
- CreateClusterDatabase
- DeleteClusterDatabase
- DescribeClusterDetailDatabases
- ModifyClusterDatabase
- OpenWan
- SwitchClusterVpc
- OpenReadOnlyInstanceExclusiveAccess
- OpenClusterReadOnlyInstanceGroupAccess
- ModifyDBInstanceSecurityGroups
- DescribeProjectSecurityGroups
- DescribeDBSecurityGroups
- SwitchProxyVpc
- DescribeFlow
- DescribeZones
- ModifyVipVport
- Data Types
- Error Codes
- FAQs
- Service Agreement
- TDSQL-C Policy
- General References
- Glossary
- Contact Us
Description of Supported Type Conversion Functions
Last updated: 2025-01-09 14:13:36
Currently, the read-only analysis engine supports most of MySQL's type functions, but there are still limitations and incompatibilities in certain scenarios. This document introduces the list of supported type functions in the read-only analysis engine, and enumerates type restrictions on input parameters. Input parameters and functions not mentioned in the document are not supported.
The main type conversion function is the CAST function.
Note:
If there are different types of values for comparison or calculation in a SQL expression, implicit conversion will be triggered. All implicit conversion logic that occurs during usage is subject to the conversion support shown in the table below. If there are operation scenarios such as comparing or calculating any value which does not support implicit conversion, an error message will be displayed, indicating that such conversion is not supported.
Syntax:
CAST (expression AS data_type)The detailed type conversion support in the read-only analysis engine is shown in the table below. Any type conversion not marked in the table is not supported.
Source/Target | Binary | Char | Date | DateTime | Decimal | Double | Float | Real | Signed | Time | Unsigned | Year |
Bigint | ✓ | ✓ | × | × | ✓ | ✓ | × | ✓ | ✓ | × | ✓ | × |
Binary | ✓ | × | × | × | ✓ | ✓ | × | ✓ | ✓ | × | ✓ | × |
Date | ✓ | × | ✓ | ✓ | × | × | × | × | × | ✓ | × | × |
Datetime | ✓ | × | ✓ | ✓ | × | × | × | × | × | ✓ | × | × |
Decimal | ✓ | ✓ | × | × | ✓ | ✓ | × | ✓ | ✓ | × | ✓ | × |
Double | ✓ | ✓ | × | × | ✓ | ✓ | × | ✓ | × | × | × | × |
Float | ✓ | ✓ | × | × | ✓ | × | ✓ | ✓ | ✓ | × | ✓ | × |
Real | ✓ | ✓ | × | × | ✓ | ✓ | × | ✓ | × | × | × | × |
Signed | ✓ | ✓ | × | × | ✓ | ✓ | × | ✓ | ✓ | × | ✓ | × |
Time | × | × | × | × | × | × | × | × | × | × | × | × |
Unsigned | ✓ | ✓ | × | × | ✓ | ✓ | × | ✓ | ✓ | × | ✓ | × |
Year | ✓ | ✓ | × | × | ✓ | ✓ | × | ✓ | ✓ | × | ✓ | × |
Varchar | ✓ | ✓ | × | × | ✓ | ✓ | × | ✓ | ✓ | × | ✓ | × |
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