sql - Make column value of table the result of 3 strings concatenated together MS Access 2013 -

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one of columns called "code" should store result of concatenating 3 strings together. these 3 strings retrieved same table, 3 different columns. how can in vba? or there easier way in access?

i want autocalculated once user finishes entering data in form or table. know can done in query pretty i'm finding difficult in table.

use default value in table https://support.office.com/en-gb/article/examples-of-expressions-d3901e11-c04e-4649-b40b-8b6ec5aed41f


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