Need help to PIVOT/UNPIVOT some data in SQL

Question

I am having some difficulty trying to achieve some data in MSSQL. Here what I have:

SO_ID | SO_DATE | WAGE_A | WAGE_B | WAGE_B_DUR | 
1     | 12/12/06| 100    |   200  |    15      | 
2     | 10/10/06| 150    |   250  |    10      |

What I want :

SO_ID | SO_DATE | WAGE_TYPE | AMOUNT | DURATION |
1     | 12/12/06| WAGE_A    | 100    | NULL     |
1     | 12/12/06| WAGE_B    | 200    | 15       |
2     | 10/10/06| WAGE_B    | 250    | 10       |
2     | 10/10/06| WAGE_A    | 150    | NULL     |

I really appreciate it if you could give me some help or advice (including change the first table).

Answer 1

Try as:

CREATE TABLE try_val(SO_ID int, SO_DATE int, WAGE_A int, WAGE_B int, WAGE_B_DUR int) 

insert into try_val values (1     , 12/12/06, 100    ,   200  ,    15      ) 
insert into try_val values (2     , 10/10/06, 150    ,   250  ,    10      )


select SO_ID,SO_DATE,'WAGE_A' AS WAGE_TYPE,WAGE_A AS AMOUNT,NULL AS DURATION from try_val 
UNION ALL
select SO_ID,SO_DATE,'WAGE_B' AS WAGE_TYPE,WAGE_A AS AMOUNT,WAGE_B_DUR  AS DURATION from try_val
ORDER BY SO_ID