SQL Constraint 2

Which constraint is used to enforce a relationship between two tables ?

Unique key constraints define a column or series of columns that uniquely identify a given row in a table.

Which of the following constraint allows null value ?

Which of the following constraints are integrity constraints ?

Which of the above is correct to create composite primary key order_id and  item_no in Product table ?

Which of the following is corect format to create primary key ?

Which of the following are  not true about Foreign Key ?

Which of the  option is used  ,If rows are deleted from the parent table, referenced rows field will automatically be set to null in the child table.

How to use 'Check' constraint to create table and ensure no employee is paid less 20000 and greater than 4000 ?

How to enable all the referenced foreign keys and the primary or unique key ?