SQL set operations combine the output of two or more SELECT statements into a single result set. The set operators…
What is an Alias? An SQL alias is simply an alternative name that can be used to refer to a…
In the previous section we saw Aggregate Functions, in this section let us discuss Scalar Functions. Scalar Function: A scalar…
What are SQL Functions? SQL functions are predefined routines that can be invoked by SQL queries to perform specific operations…
What are the SQL Constraints? SQL constraints are rules that limit the types of data that can be inserted or…
The AND and OR operators are used in SQL to filter data and produce precise results based on conditions. Multiple…
What is the SQL DISTINCT keyword? The SQL DISTINCT keyword is used in conjunction with the SELECT statement to remove…
The HAVING clause in SQL Server includes one or more conditions that must be TRUE for groups of records. It's…