How to count tuples containing the same value?

Question

Suppose these are the columns:

 **name**     **course**
   andy          bio         
   brian         math
   andy          chem

How can I count the name "andy" appeared twice?

Answer 1

You could use group by and count by name

Something like:

SELECT name, COUNT(*) FROM my_table GROUP BY name

Here's a SQLFiddle to demonstrate: http://sqlfiddle.com/#!2/966da/1