Kiwango cha 7.6 cha Kitabu cha Mazoezi SQL
Imepewa jedwali:
| id | name | grade |
|---|---|---|
| 1 | John | 91 |
| 2 | Alex | 92 |
| 3 | Evans | 72 |
| 4 | Alisa | 85 |
| 5 | Donella | 66 |
| 6 | Lauren | 79 |
| 7 | Matthew | 56 |
| 8 | Andrew | 62 |
| 9 | Richard | 55 |
| 10 | Sam | 50 |
Fanyia jedwali hili matatizo yafuatayo:
Tafuta wastani wa alama za wanafunzi, ukizingatia wale tu walio na alama za juu kuliko wastani.
Tafuta idadi ya wanafunzi ambao hawana alama za juu kuliko 90.
