How do I delete a foreign key constraint in SQL?
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How do I delete a foreign key constraint in SQL?
To delete a foreign key constraint
- In Object Explorer, expand the table with the constraint and then expand Keys.
- Right-click the constraint and then click Delete.
- In the Delete Object dialog box, click OK.
How do you fix the delete statement conflicted with the reference constraint?
You can go to the child table and delete the child rows referenced by the parent key. Then you can delete the parent row. This is essentially what the cascade delete does. This way, you do not have to drop/recreate/alter your constraints.
How do I fix too many errors in SQL?
For example, the subquery in a WHERE or HAVING clause may return too many columns, or a VALUES or SELECT clause may return more columns than are listed in the INSERT. Action: Check the number of items in each set and change the SQL statement to make them equal.
How do I delete a reference constraint in SQL?
The DROP CONSTRAINT command is used to delete a UNIQUE, PRIMARY KEY, FOREIGN KEY, or CHECK constraint.
- DROP a UNIQUE Constraint. To drop a UNIQUE constraint, use the following SQL:
- DROP a PRIMARY KEY Constraint. To drop a PRIMARY KEY constraint, use the following SQL:
- DROP a FOREIGN KEY Constraint.
How do you delete a reference in SQL?
To remove a table reference from an SQL statement in the SQL Query Builder:
- Right-click the table reference in the Tables pane, and then click Remove Table on the pop-up menu.
- Click the table reference in the Tables pane, and then press Delete.
Can we delete foreign key without deleting primary key?
To successfully change or delete a row in a foreign key constraint, you must first either delete the foreign key data in the foreign key table or change the foreign key data in the foreign key table, which links the foreign key to different primary key data.
What happens if primary key is deleted?
You can delete (drop) a primary key in SQL Server by using SQL Server Management Studio or Transact-SQL. When the primary key is deleted, the corresponding index is deleted. This may be the clustered index of the table, causing the table to become a heap.
How do I fix too many errors in Oracle?
