* Unique Constraint >>>> It will not allow the duplicate values and it will allow only one null value. >>>> We can apply this constraint Columns level & Table level >>>> We can add the unique ...

The term "data integrity" can mean different things to different people, but the most difficult and pervasive problem facing organizations these days is the semantic integrity of the data. As ...

create table snapdeal_orders ( order_Id int not null, -- now we can not add null value in column order_id , not null constraint order_date date, -- "yyyy-mm-dd" is standard format product_name varchar ...