How to auto insert computed value when new data is created??

I'm new to APEX and was trying to solve this:
To make it simple: I have a table, square_table, with two fields: input_number and square_value.
All I want to do is when a user enters an input_number from 'the form and report template', the squared value is automatically computed and saved along with the new number to the square_table.
Would someone post a solution (as details as possible, pls :)? I have watched numerous tutorials and no luck.
Many Thanks,

Poor design. You should not do this, even for strictly educational purposes. Stick to 3NF as much as possible, and only denormalize if a)you REALLY REALLY REALLY need to do it, AND b)your denormalized design survives peer review, AND c)you document VERY WELL the rationale behind such a design. Please read this - look for "Calculated Values".
Anyway. You could do this at least two ways:
1) Create a Page Process in your APEX application. Not a good idea, as other sources of INSERTs (sqplus, client/server apps) will not do the calculation unless coded to do so, and doing so would create multiple points of maintenance and documentation and testing, no to mention the added complexity of dealing with several potential development environments; or
2) Create a good old plain trigger.
If this was not a flawed design, I'd go for (2). It is basic SQL homework, well documented and simple to implement.
Regards,
Georger
user11288935 wrote:
I'm new to APEX and was trying to solve this:
To make it simple: I have a table, square_table, with two fields: input_number and square_value.
All I want to do is when a user enters an input_number from 'the form and report template', the squared value is automatically computed and saved along with the new number to the square_table.
Would someone post a solution (as details as possible, pls :)? I have watched numerous tutorials and no luck.
Many Thanks,

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