Count the number of occurrences in a procedure

Question

I have a procedure that outputs a list of rows with your standard basic SELECT statement using a few joins and where clauses.

Employee        Value
--------------------------
Tommy Elliott   Damage
Tommy Elliott   Overage
Tommy Elliott   Damage
Tommy Elliott   Shortage
Tommy Elliott   Damage
Tommy Elliott   Shortage
Trevor Gray     Overage
Trevor Gray     Shortage
Trevor Gray     Overage
Trevor Gray     Shortage
Trevor Gray     Overage
Trevor Gray     Shortage

I am wondering if anyone would know of a solution where I can either add a new SELECT statement below this one or within the same SELECT statement that would be able to:

• count the number of times Tommy and Trevor appear (which should be six based on the data above)

• and for Tommy and Trevor, count the number of times they have a value of damage, overage, or shortage.

I've been trying to figure it out and can't. I'm sure there's a quick solution to COUNT .

Answer 1

The analytic version of COUNT() can add these as column values and preserve the detail you want. Assuming your query starts like this:

SELECT
  Employee,
  Value
FROM ... and the rest of your query

... add the counts like this:

SELECT
  Employee,
  Value,
  COUNT(*) OVER (PARTITION BY Employee) AS ThisEmpCount,
  COUNT(CASE WHEN Value = 'Damage' THEN 1 END)
    OVER (PARTITION BY Employee) AS ThisEmpDamageCount,
  COUNT(CASE WHEN Value = 'Outage' THEN 1 END)
    OVER (PARTITION BY Employee) AS ThisEmpOutageCount
FROM ... and the rest of your query

Answer 2

select T.Employee, COUNT(T.Employee)
from 
(
  your query
)T
group by T.Employee

Answer 3

SELECT Employee, Value, Count(1) as No_Of_Times
FROM [Table]
GROUP BY Employee, Value
ORDER BY Employee, Value