How to get the transpose in sql (HANA)?

问题

I have a query which returns the table which is like

 SELECT (CASE WHEN type=1 THEN 'A' 
                 WHEN type=2 THEN 'B' 

           END) as TYPE,COUNT(*) AS COUNT
            from TYPE_TABLE GROUP BY TYPE

(I use case to have the count in each types).

count     type
_____     _____
123         A
124         B
120         C

I want to have the table to be like this

 A       B       C
___     ___     ___
123      124     120

So actually I need the transpose of the column count.How do I get this in HANA?

回答1:

A pure SQL solution (SQL Server)

select 
  [A] 
  , [B]
  , [C]
from
(
  select Type,[Count]
  from ( SELECT (CASE WHEN type=1 THEN 'A' 
             WHEN type=2 THEN 'B' 
             .....   
       END) as TYPE,COUNT(*) AS COUNT
        from TYPE_TABLE GROUP BY TYPE) Table1
) x
pivot
(
  SUM(Count)
  for Type in([A], [B], [C])
)p

Demo

回答2:

Since there are only 3

you could just

SELECT SUM(CASE WHEN TYPE = 1 THEN 1 ELSE 0 END) AS A,
       SUM(CASE WHEN TYPE = 2 THEN 1 ELSE 0 END) AS B,
       SUM(CASE WHEN TYPE = 3 THEN 1 ELSE 0 END) AS C
FROM yourTable

来源：https://stackoverflow.com/questions/43131323/how-to-get-the-transpose-in-sql-hana