How do you transpose rows into columns in a SQL query - sql

Question

I have this output:
Contact_Type Category_Type Category_Count
---------------------------------------------------
Window Admissions 1775
Window Financial Aid 17377
Window Miscellaneous 2720
Window Student Financials 14039
Phone Admissions 5758
Phone Financial Aid 10048
Phone Miscellaneous 4497
Phone Registration 11
Phone Student Financials 4857
and this is my query:
SELECT
Contact_Type, Category_Type1, Category_Type2, Category_Type3,
Category_Type4, Category_Type5
FROM
(SELECT
CASE
WHEN event.contact_type = 0 THEN 'Window'
WHEN event.contact_type = 1 THEN 'Phone'
END AS Contact_Type,
cat.category_type AS Category_Type,
COUNT(ec.category_id) AS Category_Count,
'Category_Type' + CAST(ROW_NUMBER() OVER (PARTITION BY Contact_Type
ORDER BY Contact_Type) AS varchar(20)) AS ColumnSequence
FROM
yLines.ylines_event AS Event
JOIN
ylines.ylines_event_category AS ec ON ec.event_id = event.event_id
JOIN
ylines.ylines_category AS cat ON ec.category_id = cat.category_id
WHERE /*event.contact_type = '0' AND*/
CAST(FORMAT(event.event_date_time, 'yyyy') AS int) BETWEEN 2014 AND dateadd(year, 1, event.event_date_time)
GROUP BY
Category_Type, Contact_Type) a
PIVOT
(MAX(Contact_Type)
FOR ColumnSequence IN (Category_Type1, Category_Type2, Category_Type3,
Category_Type4, Category_Type5)) as piv;
If I run this it gives me an error:
Msg 207, Level 16, State 1, Line 1
Invalid column name 'Contact_Type'
and I can't seem to fix this. I am trying to transpose it so I see two rows only with 'Windows' and 'Phone' and the five Category Types transposed as five columns with the count in each. I am writing T-SQL statements. Please help!

Answer 1

I would try do it in dynamic
; WITH [CONTACT]
AS (
SELECT *
FROM (
VALUES
('Window', 'Admissions ', ' 1775')
, ('Window', 'Financial Aid ', '17377')
, ('Window', 'Miscellaneous ', ' 2720')
, ('Window', 'Student Financials', '14039')
, ('Phone ', 'Admissions ', ' 5758')
, ('Phone ', 'Financial Aid ', '10048')
, ('Phone ', 'Miscellaneous ', ' 4497')
, ('Phone ', 'Registration ', ' 11')
, ('Phone ', 'Student Financials', ' 4857')
) X ([Contact_Type], [Category_Type], [Category_Count])
)
SELECT *
INTO #TEMP_PIVOT
FROM [CONTACT]
DECLARE #TYPE VARCHAR(MAX)
SET #TYPE = STUFF(
(SELECT DISTINCT ', ' + QUOTENAME(RTRIM(LTRIM([CATEGORY_TYPE])))
FROM #TEMP_PIVOT
FOR XML PATH('')
)
, 1, 1, '')
DECLARE #SQL VARCHAR(MAX)
SET #SQL = ' SELECT [CONTACT_TYPE] '
+ ' , ' + #TYPE
+ ' FROM #TEMP_PIVOT '
+ ' PIVOT ( '
+ ' MAX([CATEGORY_COUNT]) '
+ ' FOR [CATEGORY_TYPE] IN (' + #TYPE + ')'
+ ' ) P '
EXECUTE (#SQL)

Answer 2

In the group by clause you say
`group by Category_Type, Contact_Type`
However, you have defined a calculated column as contact_type which is not available in the group by clause. You should use
GROUP BY Category_Type, -- Contact_Type
case
when event.contact_type=0 then 'Window'
when event.contact_type=1 then 'Phone'
end
It is a better approach to name your calculated columns different than the columns in any of your tables.

Answer 3

Use case statements for pivoting:
SELECT CONTACT_TYPE,
SUM(CASE WHEN CATEGORY_TYPE='Admissions' THEN CATEGORY_COUNT END) ADMISSIONS,
SUM(CASE WHEN CATEGORY_TYPE='Financial Aid' THEN CATEGORY_COUNT END) FINANCIAL_AID,
SUM(CASE WHEN CATEGORY_TYPE='Miscellaneous' THEN CATEGORY_COUNT END) MISCELLANEOUS,
SUM(CASE WHEN CATEGORY_TYPE='Student Financials' THEN CATEGORY_COUNT END) STUDENT_FINANCIALS,
SUM(CASE WHEN CATEGORY_TYPE='Registration' THEN CATEGORY_COUNT END) REGISTRATION
FROM TEST_3 GROUP BY CONTACT_TYPE;
Output:
CONTACT_TYPE ADMISSIONS FINANCIAL_AID MISCELLANEOUS STUDENT_FINANCIALS REGISTRATION
Phone [phone] 4857 11
Window 1775 17377 2720 14039 null