How to make a computed field in query within base

English
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#1

Table.Amount = num
calculate new field: Tax = Amount * 0.2

#2

I think it is necessary to use sql mode to set up your query and be able to make a calculated field.

#3

Can someone explain how to go about doing this in SQL? I have a table that has customer purchases entered as they purchase. I want to be able to Query and have a sum of those purchases only for the selected customer.

#4

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