Question

I have a table like below

 Board Component Cost

    b1     c1       5
    b1     c2       10
    b2     c3       15
    b3     c4       20
    b3     c5       25
    b4     C6       25
  ---------------------
                  100%

I shoud give the input to get the values from the table, say…

If the input is 20%

the output should be

 Board Component Cost

    b1      c1      5
    b1      c2     10
    b2      c3     15

If the input is 50%

the output should be

 Board Component Cost

    b1      c1      5
    b1      c2     10
    b2      c3     15
    b3      c4     20

and so on

How to write the query in sql server

Answer 1

DECLARE @T TABLE (Col1 VARCHAR(10), Col2 VARCHAR(10), Col3 INT, SumValue Int)

INSERT INTO @T(Col1, Col2, Col3)
VALUES ('b1','c1',5)

INSERT INTO @T(Col1, Col2, Col3)
VALUES ('b1','c2',10)

INSERT INTO @T(Col1, Col2, Col3)
VALUES ('b2','c3',15)

INSERT INTO @T(Col1, Col2, Col3)
VALUES ('b3','c4',20)

INSERT INTO @T(Col1, Col2, Col3)
VALUES ('b3','c5',25)

INSERT INTO @T(Col1, Col2, Col3)
VALUES ('b4','C6',25) 

DECLARE @SumValue INT

UPDATE @T
SET @SumValue=SumValue = ISNULL(@SumValue,0)+ Col3
FROM @T T

SELECT *
FROM @T
WHERE SumValue <= (
    SELECT TOP 1 SumValue
    FROM @T AS T
    WHERE T.SumValue>=40
    ORDER BY SumValue)