How to auto update a column from other columns

How to auto update a column from other columns

daituzhangdaituzhang Posts: 1Questions: 1Answers: 0

For example:
I have column a, b, c and d. Column d will be hidden and the value = a + b.
How can I bind column d with column a and b,
so that whenever column a or column b is edited or a new row is added, column d's value will be automatically generated and write into database?

Great thanks

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