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/*
mysql> Drop table Product;
Query OK, 0 rows affected (0.01 sec)
mysql> CREATE TABLE Product
-> (
-> ID SMALLINT UNSIGNED NOT NULL PRIMARY KEY,
-> ModelID SMALLINT UNSIGNED NOT NULL,
-> UNIQUE unique_1 (ID, ModelID)
-> );
Query OK, 0 rows affected (0.06 sec)
mysql> Describe Product;
+---------+----------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------+----------------------+------+-----+---------+-------+
| ID | smallint(5) unsigned | | PRI | 0 | |
| ModelID | smallint(5) unsigned | | | 0 | |
+---------+----------------------+------+-----+---------+-------+
2 rows in set (0.00 sec)
mysql> ALTER TABLE Orders
-> DROP INDEX unique_1;
ERROR 1091 (42000): Can't DROP 'unique_1'; check that column/key exists
mysql> Describe Product;
+---------+----------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------+----------------------+------+-----+---------+-------+
| ID | smallint(5) unsigned | | PRI | 0 | |
| ModelID | smallint(5) unsigned | | | 0 | |
+---------+----------------------+------+-----+---------+-------+
2 rows in set (0.00 sec)
*/
Drop table Product;
CREATE TABLE Product
(
ID SMALLINT UNSIGNED NOT NULL PRIMARY KEY,
ModelID SMALLINT UNSIGNED NOT NULL,
UNIQUE unique_1 (ID, ModelID)
);
Describe Product;
ALTER TABLE Orders
DROP INDEX unique_1;
Describe Product;
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