What are the SQL Constraints? SQL constraints are rules that limit the types of data that can be inserted or…

What are SQL Functions? SQL functions are predefined routines that can be invoked by SQL queries to perform specific operations…

In the previous section we saw Aggregate Functions, in this section let us discuss Scalar Functions. Scalar Function: A scalar…

What is an Alias? An SQL alias is simply an alternative name that can be used to refer to a…

What is an SQL Join? The SQL Join clause is used to combine rows from two or more related tables…

SQL set operations combine the output of two or more SELECT statements into a single result set. The set operators…

What is an SQL Sequence? Database systems offer sequence to produce unique numeric values in a series according to defined…

What are SQL Views? Views are virtual tables in SQL. A view, like every other table in the database, has…