将行转换为单列

Question

I have a grid element which requires input values in a single column

 Key_id  event1    name1  date1   price1   event2   name2  date2   price2 
  234   Marriage   Sasha  09-DEC   4300   Birthday  Kate   10-DEC   3000

My SQL query output will return data listed in rows

Key_id  event     Name    date     price
 234   Marriage   Sasha  09-DEC    4300
 234   Birthday   Kate   10-DEC    3000

So i need to transpose or convert the list of rows to columns based on key_id.The values are not fixed and will be dynamic based on the time period selected by the user.

I have gone through similar questions in this forum , But i would like to know whether the same thing can be achieved using any Java API or SQL queries.

Kindly enlighten me on how to achieve this ..

Thanks

Answer 1

From your question I guess you want to transpose the horizontal axis (columns) into vertical.

Use something like:

select t.key_id
,      t.event1 event
,      t.name1  name
,      t.date1  date_event
,      t.price1 price
from   table t
union all
select t.key_id
,      t.event2 event
,      t.name2
,      t.date2
,      t.price2
from   table t

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