Скачать или смотреть GROUP BY and HAVING CLAUSE IN SQL: SQL 30 Day Challenge Day 12

Day 12 is about grouping data and filter data based on these groups in SQL. Learn the GROUP BY and HAVING clauses to get statistical summaries of your data by groups and to filter data based on a grouping variable.

Video Questions:
/* return the total amount each customer
has spent on invoices in total */

/* return the total amount each customer
has spent on invoices only if the customer has spent
more than 40 */

/* return the total amount each customer
has spent on invoices only if the customer has spent
more than 40 -- we only care about CA customers */


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