A SQL Server is a relational database system developed by Microsoft. And a Transact-SQL (T-SQL) is a Microsoft’s implemenataion of SQL butwith added functionality. Queries SELECT ...
SUM It is used to calculate the total amount of a column. Example: SELECT SUM(affected_customers) AS total_affec...
PRIMARY KEYS: A primary key is used to ensure data in the specific column is unique. It is a column cannot have NULL values. It is either an existing table column or a column that is speci...
Pulling data from databases
1. What is MongoDB?
