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2. How do I create a foreign key in SQL Server? - Stack Overflow

   stackoverflow.com/questions/48772

   You first need to check if the primary-key exists for the column you want to set your foreign key to reference to. In this example, a foreign key on table T_ZO_SYS_Language_Forms is created, referencing dbo.T_SYS_Language_Forms.LANG_UID -- First, chech if the table exists...

3. How do I see all foreign keys to a table or column?

   stackoverflow.com/questions/201621

   Constraints in SQL are the rules defined for the data in a table. Constraints also limit the types of data that go into the table. If new data does not abide by these rules the action is aborted. select * from INFORMATION_SCHEMA.TABLE_CONSTRAINTS where CONSTRAINT_TYPE = 'FOREIGN KEY';

4. How to create a foreign key in phpmyadmin - Stack Overflow

   stackoverflow.com/questions/37615586

   The key must be indexed to apply foreign key constraint. To do that follow the steps. Open table structure. (2nd tab) See the last column action where multiples action options are there. Click on Index, this will make the column indexed. Open relation view and add foreign key constraint. You will be able to assign DOCTOR_ID as foreign now.

5. How can I list all foreign keys referencing a given table in SQL...

   stackoverflow.com/questions/483193

   Works great! It'd be even better if you: a) prefix all Column Names with "Fk" / "Key"), b) suffix all Column Names with "Name", c) remove underscores, d) add KeyTableSchemaName, e) add default order by: KeyTableSchemaName, KeyTableName, KeyColumnName, FkTableSchemaName, FkTableName, FkName, and f) change Column order to: KeyTableSchemaName, KeyTableName, KeyColumnName, FkTableSchemaName ...

6. sql - What is difference between foreign key and reference key? -...

   stackoverflow.com/questions/8595695

   The only and most important difference between the two keywords 'FOREIGN KEY" and "REFERENCES" keywords is though both of them make the data to be child data of the parent table, the "FOREIGN KEY" is used to create a table level constraint whereas REFERENCES keyword can be used to create column level constraint only.

7. How do I drop a foreign key in SQL Server? - Stack Overflow

   stackoverflow.com/questions/93264

   I think this will helpful to you... DECLARE @ConstraintName nvarchar(200) SELECT @ConstraintName = KCU.CONSTRAINT_NAME FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS AS RC INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS KCU ON KCU.CONSTRAINT_CATALOG = RC.CONSTRAINT_CATALOG AND KCU.CONSTRAINT_SCHEMA = RC.CONSTRAINT_SCHEMA AND KCU.CONSTRAINT_NAME = RC.CONSTRAINT_NAME WHERE KCU.TABLE_NAME ...

8. sql - Can table columns with a Foreign Key be NULL? - Stack...

   stackoverflow.com/questions/2366854

   @vimalkrishna Not neccessarily - the primary key cannot contain null, but the foreign key can be null if the child doesn't neccessarily have a parent element. For example if the parent elements are warehouses, and the child elements are products, a NULL value can mean that the product is not currently stored in a warehouse.

9. foreign key constraint naming scheme - Stack Overflow

   stackoverflow.com/questions/199498

   A note from Microsoft concerning SQL Server: A FOREIGN KEY constraint does not have to be linked only to a PRIMARY KEY constraint in another table; it can also be defined to reference the columns of a UNIQUE constraint in another table. so, I'll use terms describing dependency instead of the conventional primary/foreign relationship terms.

10. How can I find out what FOREIGN KEY constraint references a table...

    stackoverflow.com/questions/17501840

    Could not drop object 'dbo.UserProfile' because it is referenced by a FOREIGN KEY constraint. Msg 2714, Level 16, State 6, Line 2 There is already an object named 'UserProfile' in the database. I looked around with SQL Server Management Studio but I am unable to find the constraint. How can I find out the foreign key constraints?

11. How to add 'ON DELETE CASCADE' in ALTER TABLE statement

    stackoverflow.com/questions/1571581

    I have a foreign key constraint in my table, I want to add ON DELETE CASCADE to it. I have tried this: alter table child_table_name modify constraint fk_name foreign key (child_column_name) references parent_table_name (parent_column_name) on delete cascade; Doesn't work. EDIT: Foreign key already exists, there are data in foreign key column.