SQL Server 2012 Rows into Columns with varchar - sql-server

Question

I am looking for a solution for the following problem, which affects two tables. I already tried to search for the solution, but couldn't find the way to go.
single_value
| docId | siteNo | siteName | siteAccount | comment | docDate | extNo
---+------------+--------+---------------+-------------+---------+-------------------------+-------
1 | T000000095 | 201060 | Main Location | 92400 | NULL | 2014-10-31 00:00:00.000 | NULL
multi_value
| docId | field_no | row_no | value_char | value_date | value_num
---+------------+----------+--------+------------+------------+-----------
1 | T000000095 | 60 | 1 | NULL | NULL | 250.00
2 | T000000095 | 60 | 2 | NULL | NULL | -1.24
3 | T000000095 | 61 | 1 | Positive | NULL | NULL
4 | T000000095 | 61 | 2 | Negative | NULL | NULL
5 | T000000095 | 62 | 1 | NULL | NULL | 90000.00
6 | T000000095 | 62 | 2 | NULL | NULL | 688000.00
What I need is now an SQL statement which gives me an output like the following one for each row_no of the table multi_value for a specific docId:
| docId | siteNo | siteName | siteAccount | comment | docDate | extNo | amount | addInfo | costUnit
---+------------+--------+---------------+-------------+---------+-------------------------+-------|--------+----------+----------
1 | T000000095 | 201060 | Main Location | 92400 | NULL | 2014-10-31 00:00:00.000 | NULL | 250.00 | Positive | 90000.00
2 | T000000095 | 201060 | Main Location | 92400 | NULL | 2014-10-31 00:00:00.000 | NULL | -1.24 | Negative | 688000.00
It has to list all Information of the table 'single_value' and kind of transpose the values of the table 'multi_value'. The connection between both tables can be achieved via the docId.
The table 'multi_value' is designed in that way, that each field no only allows one specific column to be filled:
60 = value_num (amount)
61 = value_char (addInfo)
62 = value_num (costUnit)
What is the easiest way to achieve that? The table layout cannot be changed. For the transpose of the multi_value I already tried the following, but it doesn't work with the varchar datatype within the column value_char.
SELECT row_no
SUM(case when field_no = 60 then value_num else 0 end) as amount,
--(case when field_no = 61 then value_char else 0 end) as addInfo,
SUM(case when field_no = 62 then value_num else 0 end) as costUnit
FROM multi_value
WHERE docId = 'T000000095'
GROUP By
row_no
Many thanks in advance.
Thomas

Answer 1

Not very elegant, but works fine :)
SELECT row_no,
SUM(case when field_no = 60 then value_num else 0 end) as amount,
case SUM(case
when field_no = 61 then (
case value_char
when 'Positive' then 1
else 2 end
) else 0 end
) when 1 then 'Positive' else 'Negative' end as addInfo,
SUM(case when field_no = 62 then value_num else 0 end) as costUnit
FROM multi_value
GROUP By
row_no
UPDATE
WITH dist as
(
SELECT DISTINCT value_char
FROM multi_value
WHERE value_char is not null
)
, with_no as
(
select value_char, row_number() over(order by value_char) [no]
from dist
)
, [raw] as
(
SELECT m.row_no,
SUM(case when m.field_no = 60 then m.value_num else 0 end) as amount,
SUM(case when m.field_no = 61 then d.[no] else 0 end) as addInfo,
SUM(case when m.field_no = 62 then m.value_num else 0 end) as costUnit
FROM multi_value m
LEFT JOIN with_no as d on d.value_char = m.value_char
GROUP By
m.row_no
)
SELECT row_no
, amount
, d.value_char as addInfo
, costUnit
FROM [raw] r
LEFT JOIN with_no as d on d.[no] = r.addInfo