Very Easy
Count entries in a table
Count the number of students in the students table. Assume that each row represents a unique student.
SCHEMA
students
+------------+------------+-----------+-----+------------+
| student_id | first_name | last_name | age | class_code |
+------------+------------+-----------+-----+------------+
| 1 | Mike | Chaplin | 12 | 7A |
| 2 | Emily | Jackson | 12 | 7A |
| 3 | Robert | Jackson | 12 | 7A |
| ... | ... | ... | ... | ... |
+------------+------------+-----------+-----+------------+
EXPECTED OUTPUT
```sql +--------------+ | num_students | +--------------+ | 75 | +--------------+
You can use COUNT(*) to count the number of rows in a table.
SELECT COUNT(*) AS num_students FROM students