How to add a primary key constraint on table or column

 How to add a primary key constraint on table or column

 

ADD PRIMARY KEY

 টেবিল তৈরীর পরে PRIMARY KEY CONSTRAINT ADD করা ।

 

SQL> alter table product

add constraint PK_PRI_PRO_ID PRIMARY KEY(product_id);

 

Table altered.

 

Not null constraint

Unique key constraint