SHOW CHARACTER SET
SHOW CHARACTER SET 语句提供 TiDB 中可用字符集的静态列表。此列表不反映当前连接或用户的任何属性。
语法图
- ShowCharsetStmt
- ShowLikeOrWhere
ShowCharsetStmt ::=
"SHOW" ( ("CHARACTER" | "CHAR") "SET" | "CHARSET" ) ShowLikeOrWhere?
ShowLikeOrWhere ::=
"LIKE" SimpleExpr
| "WHERE" Expression
示例
SHOW CHARACTER SET;
+---------+-------------------------------------+-------------------+--------+
| Charset | Description | Default collation | Maxlen |
+---------+-------------------------------------+-------------------+--------+
| ascii | US ASCII | ascii_bin | 1 |
| binary | binary | binary | 1 |
| gbk | Chinese Internal Code Specification | gbk_chinese_ci | 2 |
| latin1 | Latin1 | latin1_bin | 1 |
| utf8 | UTF-8 Unicode | utf8_bin | 3 |
| utf8mb4 | UTF-8 Unicode | utf8mb4_bin | 4 |
+---------+-------------------------------------+-------------------+--------+
6 rows in set (0.00 sec)
SHOW CHARACTER SET LIKE 'utf8%';
+---------+---------------+-------------------+--------+
| Charset | Description | Default collation | Maxlen |
+---------+---------------+-------------------+--------+
| utf8 | UTF-8 Unicode | utf8_bin | 3 |
| utf8mb4 | UTF-8 Unicode | utf8mb4_bin | 4 |
+---------+---------------+-------------------+--------+
2 rows in set (0.00 sec)
SHOW CHARACTER SET WHERE Description='UTF-8 Unicode';
+---------+---------------+-------------------+--------+
| Charset | Description | Default collation | Maxlen |
+---------+---------------+-------------------+--------+
| utf8 | UTF-8 Unicode | utf8_bin | 3 |
| utf8mb4 | UTF-8 Unicode | utf8mb4_bin | 4 |
+---------+---------------+-------------------+--------+
2 rows in set (0.00 sec)
MySQL 兼容性
SHOW CHARACTER SET 语句功能与 MySQL 完全兼容。注意，TiDB 中字符集的默认排序规则与 MySQL 有所不同，具体可以参考与 MySQL 兼容性对比。如发现任何兼容性差异，请尝试 TiDB 支持资源。