Pivot Table Missing Column - sql

Question

I am trying to use a pivot to get information in a diff format.
Here is my table:
CREATE TABLE yourtable
([case] int, [category] varchar(4))
;
INSERT INTO yourtable
([case], [category])
VALUES
(1, 'xx'),
(1, 'xyx'),
(1, 'abc'),
(2, 'ghj'),
(2, 'asdf'),
(3, 'dfgh')
;
Here is my pivot command courtesy of bluefeet:
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX)
select #cols = STUFF((SELECT distinct ',' + QUOTENAME('cat'+cast(seq as
varchar(10)))
from
(
select row_number() over(partition by [case]
order by category) seq
from yourtable
) d
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = 'SELECT [case],' + #cols + '
from
(
SELECT [case], category,
''cat''+
cast(row_number() over(partition by [case]
order by category) as varchar(10)) seq
FROM yourTable
) x
pivot
(
max(category)
for seq in (' + #cols + ')
) p '
execute sp_executesql #query;
The output is good, it is in the format I need.
CASE CAT1 CAT2 CAT3
1 abc xx xyx
2 asdf ghj (null)
3 dfgh (null) (null)
However, I also need to add additional columns to the table. The modified table would be as follows, but I'm not sure how to add this to the QUOTENAME.
CREATE TABLE yourtable
([case] int, [category] varchar(4), [status] varchar(4))
;
INSERT INTO yourtable
([case], [category], [status])
VALUES
(1, 'xx', '00'),
(1, 'xyx', '01'),
(1, 'abc', '00'),
(2, 'ghj', '01'),
(2, 'asdf', '00'),
(3, 'dfgh', '01')
;
How can this be done? Should I add an additional QUOTENAME command? Results should be:
CASE CAT1 status1 CAT2 status2 CAT3 status3
1 abc 00 xx 00 xyx 01
2 asdf 00 ghj 01 (null) (null)
3 dfgh 01 (null) (null) (null) (null)

Answer 1

Since you now have two columns that you want to PIVOT, you can first unpivot the category and status columns into a single column with multiple rows.
There are a few different ways you can unpivot the data, you can use UNPIVOT or CROSS APPLY. The basic syntax will be:
select [case],
col+cast(seq as varchar(10)) seq,
value
from
(
SELECT [case], status, category,
row_number() over(partition by [case]
order by status) seq
FROM yourTable
) d
cross apply
(
select 'cat', category union all
select 'status', status
) c (col, value)
See SQL Fiddle with Demo This will convert your multiple columns of data into something that looks like this:
| CASE | SEQ | VALUE |
|------|---------|-------|
| 1 | cat1 | xx |
| 1 | status1 | 00 |
| 1 | cat2 | abc |
| 1 | status2 | 00 |
| 1 | cat3 | xyx |
| 1 | status3 | 01 |
| 2 | cat1 | asdf |
| 2 | status1 | 00 |
Once the data is in this format, then you can apply the PIVOT function to it.
SELECT [case], cat1, status1, cat2, status2, cat3, status3
FROM
(
select [case],
col+cast(seq as varchar(10)) seq,
value
from
(
SELECT [case], status, category,
row_number() over(partition by [case]
order by status) seq
FROM yourTable
) d
cross apply
(
select 'cat', category union all
select 'status', status
) c (col, value)
) x
PIVOT
(
max(value)
for seq in (cat1, status1, cat2, status2, cat3, status3)
)p;
See SQL Fiddle with Demo
Then you can convert it to dynamic SQL:
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX)
select #cols = STUFF((SELECT ',' + QUOTENAME(col+cast(seq as varchar(10)))
from
(
select row_number() over(partition by [case]
order by category) seq
from yourtable
) d
cross apply
(
select 'cat', 1 union all
select 'status', 2
) c (col, so)
group by seq, col, so
order by seq, so
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = 'SELECT [case],' + #cols + '
from
(
select [case],
col+cast(seq as varchar(10)) seq,
value
from
(
SELECT [case], status, category,
row_number() over(partition by [case]
order by status) seq
FROM yourTable
) d
cross apply
(
select ''cat'', category union all
select ''status'', status
) c (col, value)
) x
pivot
(
max(value)
for seq in (' + #cols + ')
) p '
execute sp_executesql #query;
See SQL Fiddle with Demo The final result will be:
| CASE | CAT1 | STATUS1 | CAT2 | STATUS2 | CAT3 | STATUS3 |
|------|------|---------|--------|---------|--------|---------|
| 1 | xx | 00 | abc | 00 | xyx | 01 |
| 2 | asdf | 00 | ghj | 01 | (null) | (null) |
| 3 | dfgh | 01 | (null) | (null) | (null) | (null) |