แบบฝึกหัด

Counting the number of rows

In this exercise, you will calculate the number of orders for each concrete type. Since each row represents one order, all you need to is count the number of rows for each type of MixDesc.

คำแนะนำ

100 XP

Create a query that returns the number of rows for each type of MixDesc.

.css-6su6fj{-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;}แบบฝึกหัด

คำแนะนำ

แบบฝึกหัด