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Asked: 2026-05-11T11:46:43+00:00

Using this SQL on SQL Server 2005 SELECT CONSTRAINT_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE TABLE_NAME =

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Using this SQL on SQL Server 2005

SELECT CONSTRAINT_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE  WHERE TABLE_NAME = @TableName   AND COLUMN_NAME=@ColumnName

I get the Primary Keys AND the Foreign Keys.

How can I get only Foreign Keys? How can I see if a Constraint is a Primary or a Foreign Key?

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1 Answer

  1. I used the following SQL with SQL Server 2005 to get the Constraint Names by Primary Key:

    SELECT Constraint_Name  FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS  WHERE UNIQUE_CONSTRAINT_NAME =     (SELECT CONSTRAINT_NAME      FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE      WHERE TABLE_NAME = @TableName AND COLUMN_NAME = @ColumnName)

    To get the Constraint Name by Foreing Key:

    SELECT CONSTRAINT_NAME  FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE  WHERE TABLE_NAME = @TableName AND COLUMN_NAME = @ColumnName

    To get the Foreign Key’s Table and Field by Constraint Name:

    SELECT TABLE_NAME, COLUMN_NAME  FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE  WHERE CONSTRAINT_NAME = @ConstraintName

    To get the Primary Key’s Table and Field by Constraint Name:

    SELECT TABLE_NAME, COLUMN_NAME  FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE  WHERE CONSTRAINT_NAME =      (SELECT UNIQUE_CONSTRAINT_NAME       FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS       WHERE CONSTRAINT_NAME = @ConstraintName)
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