Inserting results of two sums together to a table - sql

Question

From my previous question, I've managed to get things to work using the Microsoft SQL Server and importing the excel file to a new database. Now, my question is dealing with writing the right sql commands. I'm trying to sum up the same column of a table twice using different criteria, and then input those numbers to a different table. I know how to insert a sum to a table, but I wonder how I can insert two sums that came from the same column simultaneously (since each time I insert, a new row is created) to the same row of a table.
Additional question: what is the way I should organize my results are dependent on values from a third table? Sample data as follows.
Some sample data:
DeptID Department
15 Eng
16 Eng
17 Mkt
18 Mkt
| Person | DeptID | Type | Number |
+--------+------------+------+---------+
| A | 15 | p1 | 1 |
| B | 18 | p2 | 5 |
| C | 16 | p2 | 10 |
| D | 17 | p1 | 7 |
| E | 18 | p1 | 11 |
| F | 16 | p2 | 12 |
So the result I should give is as such:
| Department | Sum of p1 | Sum of p2 |
+------------+------------+-----------+
| Eng | 1 | 22 |
| Mkt | 18 | 5 |
What I've tried is as follows:
select sum(Amount) as engsump1 from Sheet1$
where Department = 'Eng' and Type = 'p1'
select sum(Amount) as engsump2 from Sheet1$
where Department = 'Eng' and Type = 'p2'
select sum(Amount) as mktsump1 from Sheet1$
where Department = 'Mkt' and Type = 'p1'
select sum(Amount) as mktsump2 from Sheet1$
where Department = 'Mkt' and Type = 'p2'
Run it once and after I see the results, perform the insert into function. I'm just wondering if I can do this two steps in one step.

Answer 1

To sum the 'number' column in each group, you can use the SUM() function; Just put a case statement inside there, so you can sum the cases when type is p1, and sum the cases when type is p2.
To separate the departments, just use a GROUP BY clause. Try this:
SELECT department,
SUM(CASE WHEN type = 'p1' THEN number ELSE 0 END) AS totalP1,
SUM(CASE WHEN type = 'p2' THEN number ELSE 0 END) AS totalP2
FROM myTable
GROUP BY department;
Here is an SQL Fiddle example.