SQL: Values in column listed twice after pivot - sql

Question

When querying a specific table, I need to change the structure of the result, making it so that all values from a given year are on the same row, in separate columns that identify the category that the value belongs to.
The table looks like this (example data):
year | category | amount
1991 | A of s | 56
1992 | A of s | 55
1993 | A of s | 40
1994 | A of s | 51
1995 | A of s | 45
1991 | Total | 89
1992 | Total | 80
1993 | Total | 80
1994 | Total | 81
1995 | Total | 82
The result I need is this:
year | a_of_s | total
1991 | 56 | 89
1992 | 55 | 80
1993 | 40 | 80
1994 | 51 | 81
1995 | 45 | 82
From what I can understand I need to use pivot. However, my problem seems to be that I don't understand pivot. I've attempted to adapt the queries of solutions in similar questions where pivot seems to be part of the answer, and so far what I've come up with is this:
SELECT year, [A of s], [Total] FROM table
pivot (
max(amount)
FOR category in ([A of s], [Total])
) pvt
ORDER BY year
This returns the correct table structure, but all cells in the columns a_of_s and total are NULL, and every year is listed twice. What am I missing to get the result I need?
EDIT: After fixing the errors pointed out in the comments, the only real issue that remains is that years in the year column are listed twice.
Possibly related: Is the aggregate function I use in pivot (max, sum, min, etc) arbitrary?

Answer 1

I assumed you really don't need to pivot your table and with the result you require you can create an alternative approach to achieve it.
This is the query i made that returns according to your requirement.
;With cte as
(
select year, Amount from tbl
where category = 'A of s'
)
select
tbl1.year, tbl2.Amount as A_of_S, tbl1.Amount as Total
from tbl as tbl1
inner join cte as tbl2 on tbl1.year = tbl2.year
where tbl1.category = 'Total'
and this is the SQL fiddle i created for you with your test day. -> SQL fiddle

Answer 2

Much simpler answer:
WITH VTE AS(
SELECT *
FROM (VALUES (1991,'A of s',56),
(1992,'A of s',55),
(1993,'A of s',40),
(1994,'A of s',51),
(1995,'A of s',45),
(1991,'Total',89),
(1992,'Total',80),
(1993,'Total',80),
(1994,'Total',81),
(1995,'Total',82)) V([year],category, amount))
SELECT [year],
MAX(CASE category WHEN 'A of s' THEN amount END) AS [A of s],
MAX(CASE category WHEN 'Total' THEN amount END) AS Total
FROM VTE
GROUP BY [year];