SHOW INDEXES [FROM|IN]

SHOW INDEXES [FROM|IN] 语句用于列出指定表上的索引。SHOW INDEX [FROM | IN] 和 SHOW KEYS [FROM | IN] 是该语句的别名。包含该语句提供了 MySQL 兼容性。

语法图

ShowStmt:

ShowStmt

ShowTargetFilterable:

ShowTargetFilterable

ShowIndexKwd:

ShowIndexKwd

FromOrIn:

FromOrIn

TableName:

TableName

示例

  1. mysql> CREATE TABLE t1 (id int not null primary key auto_increment, col1 INT, INDEX(col1));
  2. Query OK, 0 rows affected (0.12 sec)
  4. mysql> SHOW INDEXES FROM t1;
  5. +-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
  6. | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
  7. +-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
  8. | t1    |          0 | PRIMARY  |            1 | id          | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
  9. | t1    |          1 | col1     |            1 | col1        | A         |           0 |     NULL | NULL   | YES  | BTREE      |         |               |
  10. +-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
  11. 2 rows in set (0.00 sec)
  13. mysql> SHOW INDEX FROM t1;
  14. +-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
  15. | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
  16. +-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
  17. | t1    |          0 | PRIMARY  |            1 | id          | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
  18. | t1    |          1 | col1     |            1 | col1        | A         |           0 |     NULL | NULL   | YES  | BTREE      |         |               |
  19. +-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
  20. 2 rows in set (0.00 sec)
  22. mysql> SHOW KEYS FROM t1;
  23. +-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
  24. | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
  25. +-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
  26. | t1    |          0 | PRIMARY  |            1 | id          | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
  27. | t1    |          1 | col1     |            1 | col1        | A         |           0 |     NULL | NULL   | YES  | BTREE      |         |               |
  28. +-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
  29. 2 rows in set (0.00 sec)

MySQL 兼容性

SHOW INDEXES [FROM|IN] 语句与 MySQL 完全兼容。如有任何兼容性差异，请在 GitHub 上提交 issue。

另请参阅