Learn what aggregate functions are, how to use them in SQL queries, and why they are useful for BI. Find examples of common scenarios and calculations.

SQL window functions provide extremely powerful and useful features that let you work with observations more easily. Different types explained here.

Hi!I often run queries on my company’s Data Warehouse, which runs DB2. Due to the nature of my permissions, I cannot create Views or new Tables – thus, everything generally has to be done in a ...

SQL is a tool that is widely used in the manipulation of data and featuring in the relational database. They are applied in querying, manipulating as well as reporting data and it is commonly used by ...

I realized how much easier my life would be if SQL had a mode() aggregate function. (I'm using it in the mathematical sense). I'm guessing that either I use SQL in a wierd way or there is a good ...