MySQL存储的GENERATED COLUMNS如何与数学表达式一起使用？
可以借助一个示例进行说明，在该示例中，我们正在名为“triangle_stored”的表中创建存储的生成列。众所周知，可以通过使用关键字“存储”来生成存储的生成列。
示例
mysql> Create table triangle_stored(SideA DOUBLE, SideB DOUBLE, SideC DOUBLE AS (SQRT(SideA * SideB + SideB * SideB)) STORED); mysql> Describe triangle_stored; +-------+--------+------+-----+---------+------------------+ | Field | Type | Null | Key | Default | Extra | +-------+--------+------+-----+---------+------------------+ | SideA | double | YES | | NULL | | | SideB | double | YES | | NULL | | | SideC | double | YES | | NULL | STORED GENERATED | +-------+--------+------+-----+---------+------------------+ 3 rows in set (0.00 sec) mysql> INSERT INTO triangle_stored(SideA, SideB) Values(1,1),(3,4),(6,8); Records: 3 Duplicates: 0 Warnings: 0 mysql> Select * from triangle_stored; +-------+-------+--------------------+ | SideA | SideB | SideC | +-------+-------+--------------------+ | 1 | 1 | 1.4142135623730951 | | 3 | 4 | 5.291502622129181 | | 6 | 8 | 10.583005244258363 | +-------+-------+--------------------+ 3 rows in set (0.00 sec)