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How MySQL stored GENERATED COLUMNS can work with mathematical expressions?
It can be illustrated with the help of an example in which we are creating a stored generated column in the table named ‘triangle_stored’. As we know that stored generated column can be generated by using the keyword ‘stored’.
Example
mysql> Create table triangle_stored(SideA DOUBLE, SideB DOUBLE, SideC DOUBLE AS (SQRT(SideA * SideB + SideB * SideB)) STORED); Query OK, 0 rows affected (0.47 sec) 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); Query OK, 3 rows affected (0.09 sec) 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)
Updated on: 21-Feb-2020
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