You will understand the concept of using scalar functions and aggregate functions in string and numeric operations in SQL databases, Understand the concept of using GROUP BY in grouping data, ...

Scalar functions are functions that return a single value of a specific data type. They can be built-in, such as GETDATE(), LEN(), or UPPER(), or user-defined, such as dbo.GetEmployeeName(@ID).

Ex: SELECT COUNT(*) FROM customers; counts the total number of customers. You can use aggregate functions in SQL queries to perform operations on a set of values and return a single calculated ...