Details about the trigger.When we work with databases, certain actions—like inserting, updating, or deleting data—often need an automatic response.For example, if a new student is added, maybe we also want to update the total count.Or if an employee’s salary is ...Read more
A foreign key is a column or set of columns in a table that refers to the primary key of another table. It is used to establish a relationship between two tables.When we study databases, one important idea is how ...Read more
What is a primary key?When we work with databases, one of the first ideas we must understand is how to uniquely identify each record. Just like every student in a class has a unique roll number, every row in a ...Read more