Advanced Aggregate Functions in SQL (GROUP BY, HAVING vs. WHERE)

In this step-by-step video tutorial, you will learn some more advanced SQL aggregation concepts by using the GROUP BY, HAVING, and WHERE clauses!

Learn about the BASIC aggregation Functions:    • Basic Aggregate Functions in SQL (COU...  

Queries:
1) Pull aggregate information with the GROUP BY clause: SELECT column1, column2, COUNT(column3) FROM table GROUP BY column1, column2
2) Use the HAVING clause to filter your aggregation: SELECT column1, COUNT(column2) FROM table GROUP BY column1 HAVING COUNT(column2) = 5
3) Use WHERE and HAVING clauses in the same query: SELECT column1, COUNT(column2) FROM table WHERE column1 = 3 GROUP BY column1 HAVING COUNT(column2) = 5

Get the Northwind Database:    • How to Load a Sample PostgreSQL Datab...  

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