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Editorial Team
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Asked: 2026-05-24T04:56:52+00:00

I would like to add a constraint which prevents adding a value to a

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I would like to add a constraint which prevents adding a value to a column if the value exists in the primary key column of another table. Is this possible?

EDIT:

Table: MasterParts

MasterPartNumber (Primary Key)
Description
….

Table: AlternateParts

MasterPartNumber (Composite Primary Key, Foreign Key to MasterParts.MasterPartNumber)
AlternatePartNumber (Composite Primary Key)

Problem – Alternate part numbers for each master part number must not themselves exist in the master parts table.

EDIT 2:

Here is an example:

MasterParts

MasterPartNumber    Decription         MinLevel     MaxLevel    ReOderLevel
010-00820-50        Garmin GTN™ 750    1            5           2

AlternateParts

       
MasterPartNumber    AlternatePartNumber         
010-00820-50        0100082050          
010-00820-50        GTN750
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1 Answer

  1. Editorial Team

    only way I could think of solving this would be writing a checking function(not sure what language you are working with), or trying to play around with table relationships to ensure that it’s unique

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