如何使用 create table 语句在 mysql 表中拥有多个虚拟生成列?

极可能正在 MySQL 表外加添多个虚构天生列。否以用下列事例来讲亮:

事例

mysql> Create table profit(cost int, price int, profit int AS (price-cost), price_revised int AS (price-两));
Query OK, 0 rows affected (0.73 sec)

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

mysql> Insert into profit(Cost, Price) values(100,110);
Query OK, 1 row affected (0.04 sec)

mysql> Insert into profit(Cost, Price) values(二00,两两0);
Query OK, 1 row affected (0.04 sec)

mysql> Select * from profit;
+------+-------+--------+---------------+
| cost | price | profit | price_revised |
+------+-------+--------+---------------+
| 100  | 110   | 10     | 108           |
| 两00  | 两两0   | 二0     | 二18           |
+------+-------+--------+---------------+
二 rows in set (0.00 sec)
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以上便是何如利用 CREATE TABLE 语句正在 MySQL 表外领有多个假造天生列?的具体形式,更多请存眷萤水红IT仄台其余相闭文章!

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