TSQL Pivot 表行到列

Question

I've got some data in a table that looks like the following. I'm trying to run a query that will get my data on a single row per requestId. I don't need the dates or the denial reason just the eprojman and apvStatus for each groupId

requestId - projMan1 - apvStatus1 - projMan2 - apvStatus2 - projMan3 - apvStatus3 etc.. for all 5 groupIds

requestId	groupId	entryDate	approvalDate	apvStatus	projMan	denialReason
1	1	2020-11-02	2019-07-25	APPROVED	rx1942	NULL
1	2	2020-11-02	2019-07-25	APPROVED	ma2674	NULL
1	3	2020-11-02	2019-07-25	APPROVED	cb9097	NULL
1	4	2020-11-02	2019-07-25	APPROVED	bj1763	NULL
1	5	2020-11-02	2019-07-25	APPROVED	tr5972	NULL
2	1	2020-11-02	NULL	NOT APPROVED	NULL	6
2	2	2020-11-02	NULL	PENDING	ma2674	NULL
2	3	2020-11-02	NULL	PENDING	cb9097	NULL
2	4	2020-11-02	NULL	PENDING	bj1763	NULL
2	5	2020-11-02	NULL	PENDING	tr5972	NULL

I've been trying to use a PIVOT table but all the examples I find involves summing data or something. I just pretty much want to take the 5 rows and turn it into 1 for each requestID

The only thing I've been able to come up with is to select from the same table 5 times for each groupID and union it but that's slower than heck. Got to be a better way

Thanks.

Current query:

select group1.requestId
    , group1.apvStatus as apvStatus1
    , group1.projMan as projMan1
    , group2.apvStatus as apvStatus2
    , group2.projMan as projMan2
    , group3.apvStatus as apvStatus3
    , group3.projMan as projMan3
    ,group4.apvStatus as apvStatus4
    , group4.projMan as projMan4
    ,group5.apvStatus as apvStatus5
    , group5.projMan as projMan5
    ,group1.denialReason 
    INTO #TEMPBAOrganized
    from (
    select requestId, apvStatus, projMan, denialReason from #TEMPBULKAPPROVAL where groupId = 1) group1
    INNER JOIN 
    (select requestId, apvStatus, projMan, denialReason from #TEMPBULKAPPROVAL where groupId = 2) group2
    on group1.requestId = group2.requestId
    INNER JOIN
    (select requestId, apvStatus, projMan from #TEMPBULKAPPROVAL where groupId = 3) group3
    on group1.requestId = group3.requestId
    INNER JOIN
    (select requestId, apvStatus, projMan from #TEMPBULKAPPROVAL where groupId = 4) group4
    on group1.requestId = group4.requestId
    INNER JOIN
    (select requestId, apvStatus, projMan from #TEMPBULKAPPROVAL where groupId = 5) group5
    on group1.requestId = group5.requestId

Answer 1

You can do it with something like this:

SELECT
    requestId,
    approvalDate_1 = MAX(approvalDate_1),
    approvalDate_2 = MAX(approvalDate_2),
    approvalDate_3 = MAX(approvalDate_3),
    approvalDate_4 = MAX(approvalDate_4),
    approvalDate_5 = MAX(approvalDate_5), 
    projMan_1 = MAX(projMan_1),
    projMan_2 = MAX(projMan_2),
    projMan_3 = MAX(projMan_3),
    projMan_4 = MAX(projMan_4),
    projMan_5 = MAX(projMan_5)
FROM
(
SELECT
    requestId,
    groupId, 
    approvalDate,
    projMan,
    'approvalDate_' + CAST( (DENSE_RANK() OVER(PARTITION BY requestId ORDER BY groupId)) AS VARCHAR(2)) AS approvalDatePivot,
    'projMan_' + CAST( (DENSE_RANK() OVER(PARTITION BY requestId ORDER BY groupId)) AS VARCHAR(2)) AS projManPivot
FROM
  @tbl
) T
PIVOT (
  MAX(approvalDate) FOR approvalDatePivot IN ([approvalDate_1],[approvalDate_2],[approvalDate_3],[approvalDate_4],[approvalDate_5])
) pvt_1
PIVOT (
  MAX(projMan) FOR projManPivot IN ([projMan_1],[projMan_2],[projMan_3],[projMan_4],[projMan_5])
) pvt_2

GROUP BY requestId

Answer 2

For pivoting of multiple column, it is easier to use CASE expression with aggregate.

select  t.requestId,
        projMan1    = max(case when t.groupId = 1 then t.projMan end),
        apvStatus1  = max(case when t.groupId = 1 then t.apvStatus end),
        projMan2    = max(case when t.groupId = 2 then t.projMan end),
        apvStatus2  = max(case when t.groupId = 2 then t.apvStatus end),
        projMan3    = max(case when t.groupId = 3 then t.projMan end),
        apvStatus3  = max(case when t.groupId = 3 then t.apvStatus end),
        projMan4    = max(case when t.groupId = 4 then t.projMan end),
        apvStatus4  = max(case when t.groupId = 4 then t.apvStatus end),
        projMan5    = max(case when t.groupId = 5 then t.projMan end),
        apvStatus5  = max(case when t.groupId = 5 then t.apvStatus end)
from    #TEMPBULKAPPROVAL t
group by t.requestId

Note: max is also an aggregate function