You should now have sufficient skills to recognize scenarios that require the use of aggregations based on AVG, SUM, COUNT, and other set-based functions. You'll also have an understanding of the GROUP BY clause, and filtering result sets with HAVING. Also, you should be able to create queries that can be used to support the basic forms of reporting. The database typically contains dozens of tables, and it is therefore extremely important that you master creating queries over multiple tables. This includes knowledge of the functioning JOIN operators with a combination of elements of string manipulation. This chapter completes this aspect of SQL Server on Linux.
In the next chapter, we will cover topics relevant for administration and database operations.
