每隔一行插入一列

Question

I have this Table with one row Transaction Date the first row is the checkIn and the second one is the Checkout if we organized the result by date asc.

I need to pass the second row value to another column named Checkout . This table has at least 1000 records

Answer 1

You can use row_number() :

select t.*
from (select t.*,
             row_number() over (partition by studentid order by transactiondate) as seqnum
      from t
     ) t
where seqnum = 2;

This assumes that only studentid is used to identify the "first" and "second" rows. If more columns are needed, add them to the partition by clause.

Answer 2

If the checkout date you need is the second (max) date grouped by reason and you want to single out this date then try:

select 
  studentID,
  reason,
  max(transactionDate) as checkoutDate
from student
group by
  reason

Answer 3

Try using the query below

With CteCheckOut as(
Select
ROW_NUMBER() over (Partition by studentID Order by studentID,transactionDate) as Rownumber,
*
From student
)
Select studentID, transactionDate as CheckOutDate
From CteCheckOut
Where Rownumber%2 = 0