WebA foreign key certainly can, and often will, have duplicate values. Let’s say you have a table containing a list of countries. It’ll only have 200 or whatever countries in the list. But … WebSep 28, 2024 · A Foreign Key can be Duplicate; Answer: B) A Foreign Key cannot be NULL. Explanation: The option (B) is false, because a foreign key can be NULL or duplicate. Discuss this Question. 10. Foreign key is a field in a table that is _____ key in another table? Primary; Unique; Composite; None of the above;

Foreign Key Constraint - Which of the following statements is …

WebSep 14, 2012 · Sep 14, 2012 at 10:44. when working PostgreSQL with Grails Framework, the framework itself create the foreign key constraint (in the name like … WebFeb 28, 2024 · Constraints are rules that the SQL Server Database Engine enforces for you. For example, you can use UNIQUE constraints to make sure that no duplicate values are entered in specific columns that do not participate in a primary key. Although both a UNIQUE constraint and a PRIMARY KEY constraint enforce uniqueness, use a UNIQUE … does vitamin d build up in the body

Can a foreign key autoincrement? - ulamara.youramys.com

WebAdd a comment. 3. It is allowing duplicates. The only possibility which is not allowed is the duplicates of the composite keys (studentID,classID) as like "C.Champagne" said. So we … WebJun 12, 2024 · A foreign key can contain duplicate values. There is no limitation in inserting the values into the table column. While inserting any value in the foreign key … WebThe copy of the CUST_ID in the Accounts table is a foreign key; it references the matching value in the primary key of the Customers table. In the above example, the referencing table Accounts can be created with the following statement: ... A foreign key can also have different column names than the primary key. The foreign key and primary key ... factory outlets alexandria nsw