how to write SQl query for the given problem below with a self join

I was jus wondering how to write an sql query for retrieving the following
data:

Table columns... employee name, ID, employee grade, type of job pursuing.
(The "type of job" field can take one out of 3 predefined values and is non

null)- primary key of the table is employee ID

Question: I want to know the no. of each type of job pursued by employees of
each grade

Output required... employee grade, No. of type 1 jobs pursued, no. of type 2

jobs pursued, no. of type 3 jobs pursued.

regds
Raj

Hope this will help you.

Code:

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SELECT distinct grade,
        count(decode(job_type, 'Type1', 1))
                over(partition by grade) t1,
        count(decode(job_type, 'Type2', 1))
                over(partition by grade) t2,
        count(decode(job_type, 'Type3', 1))
                over(partition by grade) t3
FROM emp_grade
ORDER BY 1

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