MySQL Programming Question: Download Questions PDF
How To Drop an Existing Index in MySQL?
Answer:
If you don't need an existing index any more, you should delete it with the "DROP INDEX indexName ON tableName" statement. Here is an example SQL script:
mysql> DROP INDEX tip_subject ON tip;
Query OK, 0 rows affected (0.13 sec)
Records: 0 Duplicates: 0 Warnings: 0
<pre>mysql> SHOW INDEX FROM TIP;
+------------+-------------+--------------+-------------+...
| Non_unique | Key_name | Seq_in_index | Column_name |...
+------------+-------------+--------------+-------------+...
| 0 | PRIMARY | 1 | id |...
+------------+-------------+--------------+-------------+...</pre>
1 row in set (0.00 sec)
mysql> DROP INDEX tip_subject ON tip;
Query OK, 0 rows affected (0.13 sec)
Records: 0 Duplicates: 0 Warnings: 0
<pre>mysql> SHOW INDEX FROM TIP;
+------------+-------------+--------------+-------------+...
| Non_unique | Key_name | Seq_in_index | Column_name |...
+------------+-------------+--------------+-------------+...
| 0 | PRIMARY | 1 | id |...
+------------+-------------+--------------+-------------+...</pre>
1 row in set (0.00 sec)
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