SQL Server 2012中的存储过程

Question

I need your help in writing a stored procedure to update the data given below into a table in SQL Server.

I have uploaded a picture to ensure format is set right.

The second column which identifies the part number, example: part 100 has 103 and 104 as its components in bill of materials. However only 1 (either 103 is allocated to id 1 , part 100 or 104 is allocated to id 2 , part 100 ).

For us to differentiate during the planning bill of materials for the top level assembly, we need to update assembly hashkey (string) with the last character of component used (ex: 103 , use 3 ), 000111 becomes 300111 . Doesn't matter which component gets assigned to the parent.

Can anybody please help me with this. thanks.

Data Structure          Expected result

ID  Part  hashkey       ID  Part    hashkey
-----------------       --------------------
1   100   000111        1   100     300111
2   100   000111        2   100     400111
3   103   000111        3   103     000111
4   104   000111        4   104     000111

Data structure: expected_result

Answer 1

Try This.

DECLARE @data TABLE (ID INT, Part INT, hashkey VARCHAR(100))

INSERT INTO @data
SELECT 1, 100, '000111'
UNION ALL
SELECT 2, 100, '000111'
UNION ALL
SELECT 3, 101, '000111'
UNION ALL
SELECT 4, 102, '000111';

WITH cte
AS (
    SELECT ID, Part, hashkey, ROW_number() OVER (
            PARTITION BY part ORDER BY part ASC
            ) AS RN
    FROM @data
    )
SELECT ID, Part, CASE 
        WHEN RN > 1
            THEN cast(ID AS VARCHAR) + hashkey
        WHEN lead(RN, 1) OVER (
                ORDER BY part, RN
                ) > 1
            THEN cast(ID AS VARCHAR) + hashkey
        ELSE hashkey
        END AS hashkey
FROM cte

Answer 2

Ok, if I understand your requirement now, then this should do it:

WITH cteParent AS (
 SELECT Id, hashkey, 
   ROW_NUMBER() OVER (Partition By hashkey, Order by ID) AS rn
 FROM MyTable
 WHERE Part=100
)
, cteComponent AS (
 SELECT Id, hashkey, 
   ROW_NUMBER() OVER (Partition By hashkey, Order by ID) AS rn
 FROM MyTable
 WHERE Part<>100
)
SELECT t.Id, t.Part
, CASE
    WHEN t.Part=100 THEN RIGHT(CAST(c.Part AS varchar(31)),1) + SUBSTRING(CAST(p.hashkey AS varchar(31)), 2, LEN(CAST(t.hashkey AS varchar(31)))-1)
    ELSE CAST(t.hashkey AS varchar(31))
  END AS hashkey
FROM MyTable t
LEFT OUTER JOIN cteParent p ON t.Id=p.Id
LEFT OUTER JOIN cteComponent c 
 ON p.hashkey=c.hashkey
 AND p.rn=c.rn
ORDER BY ID asc