What is primary key in database?
By Arsal Ahmed Posted on March-20-2018 491
A primary key is a special relational database column or combinations of columns designed to uniquely identify all the table records.
- It must contain a unique value for each row of data
- It cannot contain null values.
- The primary key is inserted in the first column in which it is inserted with the name that had an ID name in column.
- The null value will not show in the column of table.
By Arsal Ahmed 20-Mar-2018 Views 491