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Asked: 2026-06-02T17:56:18+00:00

I have two tables, Table_1 with 4 columns (3 primary key) and Table_2 with

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I have two tables, Table_1 with 4 columns (3 primary key) and Table_2 with 2 column. When I try to create a foreign key constraint in Table_2, I am getting this error:

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Here are the definitions of my tables:

Table_1

CREATE TABLE [dbo].[Table_1]
(
    [Field_1] [tinyint] NOT NULL,
    [Field_2] [tinyint] NOT NULL,
    [Field_3] [tinyint] NOT NULL,
    [Field_4] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
 CONSTRAINT [PK_Table_1] PRIMARY KEY CLUSTERED 
(
    [Field_1] ASC,
    [Field_2] ASC,
    [Field_3] ASC
)

Table_2

CREATE TABLE [dbo].[Table_2]
(
    [Field_1] [tinyint] NOT NULL,
    [Field_2] [tinyint] NOT NULL
) ON [PRIMARY]

Do you have any idea on how to solve this? Thanks –

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1 Answer

  1. Editorial Team

    The primary key of Table_1 is all three of Field_1, Field_2 and Field_3. In order to reference a key in another table, you have to reference all of the columns in that key – so you would need to add Field_2 and Field_3 to Table_2, and have all three columns included when you attempt to create the foreign key constraint.

    Alternatively, if Field_1, by itself, is a key for Table_1, then declare it as such, either by redefining the primary key, or adding a UNIQUE constraint on just Field_1 to Table_1. You would then be able to create the foreign key you’re attempting to.

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