- Introduction
- Concepts
- Key Features
- Horizontal Scalability
- MySQL Compatible Syntax
- Replicate from and to MySQL
- Distributed Transactions with Strong Consistency
- Cloud Native Architecture
- Minimize ETL with HTAP
- Fault Tolerance & Recovery with Raft
- Automatic Rebalancing
- Deployment and Orchestration with Ansible, Kubernetes, Docker
- JSON Support
- Spark Integration
- Read Historical Data Without Restoring from Backup
- Fast Import and Restore of Data
- Hybrid of Column and Row Storage
- SQL Plan Management
- Open Source
- Online Schema Changes
- Key Features
- How-to
- Get Started
- Start a Cluster
- Deploy
- From Binary Tarball
- Orchestrated Deployment
- Geographic Redundancy
- Configure
- Secure
- Transport Layer Security (TLS)
- Monitor
- Migrate
- Migrate from MySQL
- Maintain
- Backup and Restore
- Identify Abnormal Queries
- Scale
- Upgrade
- Troubleshoot
- Get Started
- Reference
- SQL
- SQL Language Structure
- Data Types
- Numeric Types
- Date and Time Types
- String Types
- Functions and Operators
- Function and Operator Reference
- Type Conversion in Expression Evaluation
- Operators
- Control Flow Functions
- String Functions
- Numeric Functions and Operators
- Date and Time Functions
- Bit Functions and Operators
- Cast Functions and Operators
- Encryption and Compression Functions
- Information Functions
- JSON Functions
- Aggregate (GROUP BY) Functions
- Window Functions
- Miscellaneous Functions
- Precision Math
- List of Expressions for Pushdown
- SQL Statements
ADD COLUMNADD INDEXADMINADMIN CANCEL DDLADMIN CHECKSUM TABLEADMIN CHECK [TABLE|INDEX]ADMIN SHOW DDL [JOBS|QUERIES]ALTER DATABASEALTER TABLEALTER USERANALYZE TABLEBEGINCHANGE COLUMNCOMMITCREATE DATABASECREATE INDEXCREATE ROLECREATE TABLE LIKECREATE TABLECREATE USERCREATE VIEWDEALLOCATEDELETEDESCDESCRIBEDODROP COLUMNDROP DATABASEDROP INDEXDROP ROLEDROP TABLEDROP USERDROP VIEWEXECUTEEXPLAIN ANALYZEEXPLAINFLUSH PRIVILEGESFLUSH STATUSFLUSH TABLESGRANT <privileges>GRANT <role>INSERTKILL [TIDB]LOAD DATALOAD STATSMODIFY COLUMNPREPARERECOVER TABLERENAME INDEXRENAME TABLEREPLACEREVOKE <privileges>REVOKE <role>ROLLBACKSELECTSET DEFAULT ROLESET [NAMES|CHARACTER SET]SET PASSWORDSET ROLESET TRANSACTIONSET [GLOBAL|SESSION] <variable>SHOW ANALYZE STATUSSHOW CHARACTER SETSHOW COLLATIONSHOW [FULL] COLUMNS FROMSHOW CREATE TABLESHOW CREATE USERSHOW DATABASESSHOW ENGINESSHOW ERRORSSHOW [FULL] FIELDS FROMSHOW GRANTSSHOW INDEXES [FROM|IN]SHOW INDEX [FROM|IN]SHOW KEYS [FROM|IN]SHOW PRIVILEGESSHOW [FULL] PROCESSSLISTSHOW SCHEMASSHOW STATUSSHOW [FULL] TABLESSHOW TABLE REGIONSSHOW TABLE STATUSSHOW [GLOBAL|SESSION] VARIABLESSHOW WARNINGSSPLIT REGIONSTART TRANSACTIONTRACETRUNCATEUPDATEUSE
- Configuration
- tidb-server
- pd-server
- tikv-server
- Security
- Transactions
- System Databases
- Garbage Collection (GC)
- Performance
- Overview
- Understanding the Query Execution Plan
- The Blocklist of Optimization Rules and Expression Pushdown
- Introduction to Statistics
- TopN and Limit Push Down
- Optimizer Hints
- Check the TiDB Cluster Status Using SQL Statements
- Execution Plan Binding
- Statement Summary Table
- Tune TiKV
- Operating System Tuning
- Column Pruning
- Key Monitoring Metrics
- Best Practices
- TiDB Binlog
- Upgrade
- Reparo
- Binlog Consumer Client
- TiDB Binlog Relay Log
- Bidirectional Replication Between TiDB Clusters
- Glossary
- Troubleshoot
- Tools
- TiDB Lightning
- sync-diff-inspector
- SQL
- FAQs
- Support
- Contribute
- Releases
- All Releases
- v3.0
- v2.1
- v2.0
- v1.0
- Glossary
SET [NAMES|CHARACTER SET]
The statements SET NAMES, SET CHARACTER SET and SET CHARSET modify the variables character_set_client, character_set_results and character_set_connection for the current connection.
Synopsis
SetStmt:
Examples
mysql> SHOW VARIABLES LIKE 'character_set%';
+--------------------------+--------------------------------------------------------+
| Variable_name | Value |
+--------------------------+--------------------------------------------------------+
| character_sets_dir | /usr/local/mysql-5.6.25-osx10.8-x86_64/share/charsets/ |
| character_set_connection | utf8mb4 |
| character_set_system | utf8 |
| character_set_results | utf8mb4 |
| character_set_client | utf8mb4 |
| character_set_database | utf8mb4 |
| character_set_filesystem | binary |
| character_set_server | utf8mb4 |
+--------------------------+--------------------------------------------------------+
8 rows in set (0.01 sec)
mysql> SET NAMES utf8;
Query OK, 0 rows affected (0.00 sec)
mysql> SHOW VARIABLES LIKE 'character_set%';
+--------------------------+--------------------------------------------------------+
| Variable_name | Value |
+--------------------------+--------------------------------------------------------+
| character_sets_dir | /usr/local/mysql-5.6.25-osx10.8-x86_64/share/charsets/ |
| character_set_connection | utf8 |
| character_set_system | utf8 |
| character_set_results | utf8 |
| character_set_client | utf8 |
| character_set_server | utf8mb4 |
| character_set_database | utf8mb4 |
| character_set_filesystem | binary |
+--------------------------+--------------------------------------------------------+
8 rows in set (0.00 sec)
mysql> SET CHARACTER SET utf8mb4;
Query OK, 0 rows affected (0.00 sec)
mysql> SHOW VARIABLES LIKE 'character_set%';
+--------------------------+--------------------------------------------------------+
| Variable_name | Value |
+--------------------------+--------------------------------------------------------+
| character_set_connection | utf8mb4 |
| character_set_system | utf8 |
| character_set_results | utf8mb4 |
| character_set_client | utf8mb4 |
| character_sets_dir | /usr/local/mysql-5.6.25-osx10.8-x86_64/share/charsets/ |
| character_set_database | utf8mb4 |
| character_set_filesystem | binary |
| character_set_server | utf8mb4 |
+--------------------------+--------------------------------------------------------+
8 rows in set (0.00 sec)MySQL compatibility
This statement is understood to be fully compatible with MySQL. Any compatibility differences should be reported via an issue on GitHub.