GROUP BY groups the data fetched by SELECT The query finds the customer_id values in the payment table, collects the ‘amount’ values of those with the same customer__id value, and groups them according to the customer_id. In other words, it returns the sum of the amount values of the rows with a specific customer_id value. … Group by
The having clause specifies a search condition for a group or cluster. HAVING is often used with the GROUP BY statement to filter groups or clusters based on a certain condition. NOTE: You cannot use column aliases in the HAVING statement because the HAVING clause is evaluated before the SELECT clause. Because column aliases specified … Having
The WHERE clause filters row based on a specified condition. However, the HAVING clause filters groups of rows based on a specified condition. In other words, the WHERE clause applies to rows, while the HAVING clause applies to the group of rows. The query groups according to store_id and calculates how many customer_id rows or … Having vs Where