TSQL Pivot Throwing Syntax Errors - sql

Question

I would like to PIVOT the following query result to display a column for each Project Status Code.
WITH r AS (
SELECT ROW_NUMBER() OVER (ORDER BY ph.InsertedDateTime) rownum,
CAST(ph.InsertedDateTime AS DATE) InsertedDate, ph.Gate_1_TargetDate, ph.Gate_2_TargetDate, ph.Gate_3_TargetDate
FROM PROJECT_HIST ph
JOIN (
SELECT ProjectID, MAX(InsertedDateTime) InsertedDateTime
FROM PROJECT_HIST
GROUP BY ProjectID, CAST(InsertedDateTime AS DATE)
) ph_distinct_date ON ph_distinct_date.InsertedDateTime = ph.InsertedDateTime
AND ph_distinct_date.ProjectID = ph.ProjectID
WHERE ph.projectid = 100957
AND NOT (
ph.Gate_1_TargetDate IS NULL
AND ph.Gate_2_TargetDate IS NULL
AND ph.Gate_3_TargetDate IS NULL
)
),
fubar AS (
SELECT rownum, InsertedDate, 0 gateName, NULL targetDate FROM r
UNION ALL
SELECT rownum, InsertedDate, 1, Gate_1_TargetDate FROM r
UNION ALL
SELECT rownum, InsertedDate, 2, Gate_2_TargetDate FROM r
UNION ALL
SELECT rownum, InsertedDate, 3, Gate_3_TargetDate FROM r
)
SELECT f1.InsertedDate 'Change Date', f1.gateName 'ProjectStageCode', f1.targetDate
FROM fubar f1
LEFT JOIN fubar f2 ON f2.rownum = f1.rownum - 1
AND f2.gateName = f1.gateName
PIVOT(min(f1.InsertedDate) FOR f1.gateName IN ([0],[1],[2],[3])) AS p
WHERE f1.rownum = 1
OR f1.targetDate <> f2.targetDate
ORDER BY f1.InsertedDate
;
Without the pivot attempt, this query currently returns this result for this particular project:
What I would like to do is pivot the query to create columns for each Project Stage Code to match the following result:
Essentially, I need to have a row for each unique Change Date and have the targetDate column value fill in the respective newly pivoted numerical ProjectStageCode column.

Answer 1

From the looks of it it seems like you just need to use a subquery before you try to PIVOT the data. You also need to aggregate the targetDate instead of the InsertedDate:
WITH r AS
(
SELECT ROW_NUMBER() OVER (ORDER BY ph.InsertedDateTime) rownum,
CAST(ph.InsertedDateTime AS DATE) InsertedDate, ph.Gate_1_TargetDate, ph.Gate_2_TargetDate, ph.Gate_3_TargetDate
FROM PROJECT_HIST ph
JOIN
(
SELECT ProjectID, MAX(InsertedDateTime) InsertedDateTime
FROM PROJECT_HIST
GROUP BY ProjectID, CAST(InsertedDateTime AS DATE)
) ph_distinct_date
ON ph_distinct_date.InsertedDateTime = ph.InsertedDateTime
AND ph_distinct_date.ProjectID = ph.ProjectID
WHERE ph.projectid = 100957
AND NOT (ph.Gate_1_TargetDate IS NULL
AND ph.Gate_2_TargetDate IS NULL
AND ph.Gate_3_TargetDate IS NULL)
),
fubar AS
(
SELECT rownum, InsertedDate, 0 gateName, NULL targetDate FROM r
UNION ALL
SELECT rownum, InsertedDate, 1, Gate_1_TargetDate FROM r
UNION ALL
SELECT rownum, InsertedDate, 2, Gate_2_TargetDate FROM r
UNION ALL
SELECT rownum, InsertedDate, 3, Gate_3_TargetDate FROM r
)
SELECT ChangeDate, [0],[1],[2],[3]
FROM
(
SELECT f1.InsertedDate ChangeDate, f1.gateName, f1.targetDate
FROM fubar f1
LEFT JOIN fubar f2
ON f2.rownum = f1.rownum - 1
AND f2.gateName = f1.gateName
WHERE f1.rownum = 1
OR f1.targetDate <> f2.targetDate
) d
PIVOT
(
min(targetDate)
FOR gateName IN ([0],[1],[2],[3])
) AS p;