Below are two methods you can use to return a list of foreign keys for a given table in SQL Server.
This is similar to returning the foreign keys based on the referenced/primary key table, except here, I’m returning the foreign keys based on the referencing/foreign key table itself.
You can use the OBJECTPROPERTY() function in SQL Server to check whether or not a table has one or more foreign key constraints.
To do this, pass the table’s object ID as the first argument, and TableHasForeignKey as the second argument. The function returns a 1 or a 0 depending on whether or not it has a foreign key constraint.
A return value of 1 means that the table does have a foreign key constraint, and a value of 0 means that doesn’t. A return value of 1 applies regardless of how many foreign keys the table has (as long as it has at least one).
If you want an actual list of the foreign keys, see List All Foreign Keys on a Table in SQL Server.
If you need to return all foreign keys that reference a given table in SQL Server, try one of the following methods.
The first method queries the sys.foreign_keys system view. The second method executes the sp_fkeys system stored procedure.
You can use the OBJECTPROPERTY() function in SQL Server to check whether or not a table is referenced by a foreign key.
To do this, pass the table’s object ID as the first argument, and TableHasForeignRef as the second argument. The function returns a 1 or a 0 depending on whether or not it is referenced by a foreign key.
A return value of 1 means that the table is referenced by a foreign key, and a value of 0 means that it’s not.
Note that the examples presented here don’t list out the foreign keys or their tables or anything like that. They simply return a true/false value that you can use to test whether or not a table is referenced by a foreign key. If you need to list out all foreign keys that reference a given table, see Return All Foreign Keys that Reference a Given Table in SQL Server. The examples in that article list out each foreign key, as well as the foreign key table/s, and the primary key table.
You can use the OBJECTPROPERTY() function in SQL Server to see whether or not a table has a DEFAULT constraint.
To do this, pass the table’s object ID as the first argument, and TableHasDefaultCnst as the second argument. The function returns a 1 or a 0 depending on whether or not it has a DEFAULT constraint.
A return value of 1 means that the table has a DEFAULT constraint, and a value of 0 means that it’s not.
You can use the OBJECTPROPERTY() function in SQL Server to check whether an object is a user-defined table or not.
To do this, pass the object ID as the first argument, and IsUserTable as the second argument. The function returns a 1 or a 0 depending on whether or not it’s a user-defined table.
A return value of 1 means that it is a user-defined table, and a value of 0 means that it’s not.
You can use the OBJECTPROPERTY() function in SQL Server to check whether an object is a table-valued function or not.
To do this, pass the object ID as the first argument, and IsTableFunction as the second argument. The function returns a 1 or a 0 depending on whether or not it’s a table-valued function.
A return value of 1 means that it is a table-valued function, and a value of 0 means that it’s not.
The OBJECTPROPERTY() function in SQL Server enables you to check an object for a specific property.
You can use this function to check whether an object is a system table or not. To do this, pass the object ID as the first argument, and IsSystemTable as the second argument. The function returns a 1 or a 0 depending on whether or not it’s a system table (1 means that it is a system table, and 0 means that it’s not).
You can use the OBJECTPROPERTY() function in SQL Server to check whether or not an object is a primary key.
To find out whether an object is a primary key, pass the object ID as the first argument, and IsPrimaryKey as the second argument. The function returns a 1 or a 0 depending on whether or not it’s a primary key.
A return value of 1 means that it is a primary key, and a value of 0 means that it’s not.
You can use the OBJECTPROPERTY() function in SQL Server to find out whether or not an object is a foreign key.
To find out whether an object is a foreign key, pass the object ID as the first argument, and IsForeignKey as the second argument. The function returns a 1 or a 0 depending on whether or not it’s a foreign key.
A return value of 1 means that it is a foreign key, and a value of 0 means that it isn’t.