sql table 价格上涨

Question

我的table喜欢这样

Date        F.Type  L.Price  H.Price  increase
04/11/2019  apple   10        30        10
04/11/2019  banana   2        6        2
05/11/2019  apple    20       60        20
05/11/2019  grape   50        100       25

我的要求

Date        F.Type    Price
04/11/2019  apple     10
04/11/2019  apple     20
04/11/2019  apple     30   (L.Price+increase upto H.Price)
04/11/2019  banana    2
04/11/2019  banana    4
04/11/2019  banana    6   (L.Price+increase upto H.Price)
05/11/2019  apple    20
05/11/2019  apple    40
05/11/2019  apple    60   (L.Price+increase upto H.Price)
05/11/2019  grape    50 
05/11/2019  grape    75 
05/11/2019  grape    100  (L.Price+increase upto H.Price)

Answer 1

由于您的输入不会超过 1 步的增加，所以只需尝试 UNION

试试这个

SELECT * FROM
(
    SELECT Date, F.Type, L.Price As Price From table
    UNION ALL
    SELECT Date, F.Type, F.Price As Price From table
    UNION ALL
    SELECT Date, F.Type, F.Price - L.Price As Price From table
)T ORDER BY Date,Price

DEMO

Answer 2

如果您使用的是 MSSQL，则可以使用递归 CTE 尝试此解决方案-

DEMO HERE

WITH your_table(Date,F_Type,L_Price,H_Price,increase)
AS
(
SELECT '04/11/2019','apple',50,100,10 
UNION ALL SELECT '04/11/2019','banana',2,6,2 
UNION ALL SELECT '05/11/2019','apple',20,60,10 
UNION ALL SELECT '05/11/2019','grape',50,100,25
)

,CTE2 AS (
    SELECT 
    A.Date AD,
    A.F_Type FT,
    A.L_Price,
    A.L_Price inc,
    A.H_Price,
    A.increase
    FROM your_table A

    UNION ALL

    SELECT 
    B.AD,
    B.FT ,
    B.L_Price,
    B.inc + B.increase increase, 
    B.H_Price,
    B.increase
    FROM CTE2 B
    WHERE inc < B.H_Price
    AND AD = B.AD AND FT = B.FT
)

SELECT AD AS Date, FT AS F_Type, inc AS Price 
FROM CTE2
ORDER BY 1,2,3

sql table 价格上涨

Price increase in sql table

sql

sql-server

sql-server-2008