SHOW COLLATION
此语句提供了一个静态的字符集排序规则列表，旨在与 MySQL 客户端库保持兼容。
概要
- ShowCollationStmt
- ShowLikeOrWhere
ShowCollationStmt ::=
"SHOW" "COLLATION" ShowLikeOrWhere?
ShowLikeOrWhere ::=
"LIKE" SimpleExpr
| "WHERE" Expression
示例
SHOW COLLATION;
+--------------------+---------+-----+---------+----------+---------+---------------+
| Collation | Charset | Id | Default | Compiled | Sortlen | Pad_attribute |
+--------------------+---------+-----+---------+----------+---------+---------------+
| ascii_bin | ascii | 65 | Yes | Yes | 1 | PAD SPACE |
| binary | binary | 63 | Yes | Yes | 1 | NO PAD |
| gbk_bin | gbk | 87 | | Yes | 1 | PAD SPACE |
| gbk_chinese_ci | gbk | 28 | Yes | Yes | 1 | PAD SPACE |
| latin1_bin | latin1 | 47 | Yes | Yes | 1 | PAD SPACE |
| utf8_bin | utf8 | 83 | Yes | Yes | 1 | PAD SPACE |
| utf8_general_ci | utf8 | 33 | | Yes | 1 | PAD SPACE |
| utf8_unicode_ci | utf8 | 192 | | Yes | 8 | PAD SPACE |
| utf8mb4_0900_ai_ci | utf8mb4 | 255 | | Yes | 0 | NO PAD |
| utf8mb4_0900_bin | utf8mb4 | 309 | | Yes | 1 | NO PAD |
| utf8mb4_bin | utf8mb4 | 46 | Yes | Yes | 1 | PAD SPACE |
| utf8mb4_general_ci | utf8mb4 | 45 | | Yes | 1 | PAD SPACE |
| utf8mb4_unicode_ci | utf8mb4 | 224 | | Yes | 8 | PAD SPACE |
+--------------------+---------+-----+---------+----------+---------+---------------+
13 行结果（0.00 秒）
可以通过添加 WHERE 子句来筛选字符集。
SHOW COLLATION WHERE Charset="utf8mb4";
+--------------------+---------+-----+---------+----------+---------+---------------+
| Collation | Charset | Id | Default | Compiled | Sortlen | Pad_attribute |
+--------------------+---------+-----+---------+----------+---------+---------------+
| utf8mb4_0900_ai_ci | utf8mb4 | 255 | | Yes | 0 | NO PAD |
| utf8mb4_0900_bin | utf8mb4 | 309 | | Yes | 1 | NO PAD |
| utf8mb4_bin | utf8mb4 | 46 | Yes | Yes | 1 | PAD SPACE |
| utf8mb4_general_ci | utf8mb4 | 45 | | Yes | 1 | PAD SPACE |
| utf8mb4_unicode_ci | utf8mb4 | 224 | | Yes | 8 | PAD SPACE |
+--------------------+---------+-----+---------+----------+---------+---------------+
5 行结果（0.001 秒）
MySQL 兼容性
TiDB 中 SHOW COLLATION 语句的用法与 MySQL 完全兼容。然而，TiDB 中的字符集可能与 MySQL 默认的排序规则不同。有关详细信息，请参考 Compatibility with MySQL。如果你发现任何兼容性差异，请 report a bug。