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很可能在 MySQL 表中添加多個(gè)存儲(chǔ)的生成列。可以用以下示例來(lái)說(shuō)明：

示例

mysql> Create table profit1(cost int, price int, profit int AS (price-cost) STORED, price_revised int AS (price-2) STORED);
Query OK, 0 rows affected (0.36 sec)

mysql> Describe profit1;
+---------------+---------+------+-----+---------+------------------+
| Field         | Type    | Null | Key | Default | Extra            |
+---------------+---------+------+-----+---------+------------------+
| cost          | int(11) | YES  |     | NULL    |                  |
| price         | int(11) | YES  |     | NULL    |                  |
| profit        | int(11) | YES  |     | NULL    | STORED GENERATED |
| price_revised | int(11) | YES  |     | NULL    | STORED GENERATED |
+---------------+---------+------+-----+---------+------------------+
4 rows in set (0.00 sec)

mysql> Insert into profit1(Cost, Price) values(100,110);
Query OK, 1 row affected (0.09 sec)

mysql> Insert into profit1(Cost, Price) values(200,220);
Query OK, 1 row affected (0.09 sec)

mysql> Select * from profit1;
+------+-------+--------+---------------+
| cost | price | profit | price_revised |
+------+-------+--------+---------------+
| 100  | 110   | 10     | 108           |
| 200  | 220   | 20     | 218           |
+------+-------+--------+---------------+
2 rows in set (0.00 sec)

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