Question

I have table named Schedule which has fields named TeacherName and ClassTakenDate.The values in the table are as shown below:

TeacherName       ClassTakenDate

Anish              2011-10-01

Anish              2011-10-01

John               2011-10-01

John               2011-10-02

I want result like this :

TeacherName               NoOfDays

Anish                        1

John                         2

how we can do this?

Answer 1

SELECT TeacherName, 
       COUNT(DISTINCT ClassTakenDate) AS NoOfDays
FROM Schedule 
GROUP BY TeacherName