![]() Set Null Sets the value to null if all foreign key columns for the table can accept null values. Do not specify CASCADE if the table will be included in a merge publication that uses logical records. No Action An error message tells the user that the deletion is not allowed and the DELETE is rolled back.Ĭascade Deletes all rows containing data involved in the foreign key relationship. Specify what happens if a user tries to delete a row with data that is involved in a foreign key relationship: Choose Yes if you do not want to allow such changes, and choose No if you do want to allow them.Įxpand to show information for the Delete Rule and the Update Rule for the relationship. Specify whether changes are allowed to the data of the columns in the relationship if those changes would invalidate the integrity of the foreign key relationship. Indicates whether to enforce the constraint when a replication agent performs an insert, update, or delete on this table. This provides a larger area in which to write text.Įxpand to show information for Check Existing Data on Creation or Re-Enabling and Enforce for Replication. To write a more detailed description, click Description and then click the ellipsis (.) that appears to the right of the property field. You can change the name at any time.ĭescribe the relationship. When a new relationship is created, it is given a default name based on the table in the active window in Table Designer. Shows which column acts as a primary (or unique) key in the selected relationship.Įxpand to show the property fields for Name and Description. Shows which table contains the column acting as a primary (or unique) key in the selected relationship. Shows which column acts as a foreign key in the selected relationship. Shows which table contains the column acting as a foreign key in the selected relationship. To edit or define these values, click the ellipsis button (. Tables and Columns Specifications CategoryĮxpand to show which columns from which tables act as the foreign key and primary (or unique) key in the relationship. Verify all existing data in the table before the constraint was created or re-enabled, against the constraint. To cancel the addition of a relationship, use this button to remove the relationship.Įxpand to show Check Existing Data on Creation or RE-Enabling and Tables and Columns Specifications.Ĭheck Existing Data on Creation or Re-Enabling The Tables and Columns Specifications must be set before the relationship will be valid.ĭelete the relationship selected in the Selected Relationships list. If the list is empty, no relationships have been defined for the table.Ĭreate a new relationship. Select a relationship to show its properties in the grid to the right. In the Foreign Key Relationships dialog box, you can make the following modifications. Right-click the foreign key to be modified and select Modify. In Object Explorer, expand the table with the foreign key and then expand Keys. Using SQL Server Management Studio To modify a foreign key ![]() The new foreign key column must match the data type and size of the primary key column to which it relates, with these exceptions:Ī char column or sysname column can relate to a varchar column.Ī binary column can relate to a varbinary column.Īn alias data type can relate to its base type. Modifying a table's foreign key changes which columns are related to columns in the primary key table.īefore You Begin Limitations and Restrictions You can modify the foreign key side of a relationship in SQL Server by using SQL Server Management Studio or Transact-SQL. SQL Server 2016 (13.x) and later Azure SQL Database Azure SQL Managed Instance
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