title | summary | aliases | ||
---|---|---|---|---|
SHOW COLLATION |
TiDB 数据库中 SHOW COLLATION 的使用概况。 |
|
SHOW COLLATION
语句用于提供一个静态的排序规则列表,确保与 MySQL 客户端库的兼容性。
注意:
SHOW COLLATION
所展示的排序规则列表与 TiDB 集群是否开启新排序规则框架有关,详情请见 TiDB 字符集和排序规则)
ShowCollationStmt:
若未开启新排序规则框架,仅展示二进制排序规则:
{{< copyable "sql" >}}
SHOW COLLATION;
+-------------+---------+------+---------+----------+---------+
| Collation | Charset | Id | Default | Compiled | Sortlen |
+-------------+---------+------+---------+----------+---------+
| utf8mb4_bin | utf8mb4 | 46 | Yes | Yes | 1 |
| latin1_bin | latin1 | 47 | Yes | Yes | 1 |
| binary | binary | 63 | Yes | Yes | 1 |
| ascii_bin | ascii | 65 | Yes | Yes | 1 |
| utf8_bin | utf8 | 83 | Yes | Yes | 1 |
+-------------+---------+------+---------+----------+---------+
5 rows in set (0.02 sec)
若开启了新排序规则框架,则在二进制排序规则之外,额外支持 utf8_general_ci
和 utf8mb4_general_ci
两种大小写和口音不敏感的排序规则:
{{< copyable "sql" >}}
SHOW COLLATION;
+--------------------+---------+------+---------+----------+---------+
| Collation | Charset | Id | Default | Compiled | Sortlen |
+--------------------+---------+------+---------+----------+---------+
| ascii_bin | ascii | 65 | Yes | Yes | 1 |
| binary | binary | 63 | Yes | Yes | 1 |
| latin1_bin | latin1 | 47 | Yes | Yes | 1 |
| utf8_bin | utf8 | 83 | Yes | Yes | 1 |
| utf8_general_ci | utf8 | 33 | | Yes | 1 |
| utf8mb4_bin | utf8mb4 | 46 | Yes | Yes | 1 |
| utf8mb4_general_ci | utf8mb4 | 45 | | Yes | 1 |
+--------------------+---------+------+---------+----------+---------+
7 rows in set (0.00 sec)
SHOW COLLATION
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,具体可参考与 MySQL 兼容性对比。如发现任何其他兼容性差异,请在 GitHub 上提交 issue。