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SELECT into Calculated Value



When I insert a record, I want use a fied (named ere_
I have a table representing heirs (named scn_eredi) with these fields:
  • the scn_id referencing a records in the will table named (scn_successioni)
  • the ere_id is a unique id used to build relation between heirs and will tables
  • the ere_num should be a progressive number for each heir-person related to a will
To fill the third field I used in webform datapage a calculated value with this formula:
SELECT MAX(ere_num)+1 FROM scn_eredi a WHERE a.scn_id = "[@field:scn_id]"

I tried the statement both with  [@field:scn_id],  '[@field:scn_id]' and "[@field:scn_id]" with the same result.

It works, but it seems ignoring the WHERE statement. When I insert a second will he do not restart numbering.
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I found this that clarify it to me:

"Essentially the source table is the place where the data is coming from and the target table is the place where the data is going to or the table that an action is taking place on. They do not have to be in different schema's or have a different structure to each other and in fact they could actually be the same table."


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