MySQL中删除索引报错
mysql> show index from tester;
+--------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+--------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| tester | 0 | PRIMARY | 1 | name | A | 0 | NULL | NULL | | BTREE | | |
+--------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
1 row in set (0.00 sec)
mysql> drop index PRIMARY on tester;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'PRIMARY on tester' at line 1
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这个不能这样操作，可以先删除主键，然后索引自然就没了
mysql> alter table tester drop primary key; Query OK, 0 rows affected (0.15 sec) Records: 0 Duplicates: 0 Warnings: 02021-10-15 07:51:14赞同 展开评论 打赏
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