我有以下产品数据(对于在线商店):
ProductId ProductOptionGroupId ProductOptionId
26 1 13
26 1 12
44 1 22
44 1 23
44 2 20
44 2 21
44 3 25
44 3 24
ProductOptionGroup将是(例如)"Size"或"Color",而ProductOption将(例如)"Large","Extra Large"和"Red","Black"等.
基本上,我想找到每种产品的所有可能的产品选项组合.例如,对于产品44,我想要:
22, 20, 25 (Large, Black, Cotton)
22, 20, 24 (Large, Black, Nylon)
22, 21, 25 (Large, Red, Cotton)
22, 21, 24 (Large, Red, Nylon)
23, 20, 25 (Extra Large, Black, Cotton)
23, 20, 24 etc...
23, 21, 25
23, 21, 24
每行的每个产品选项组只有一个产品选项.即大型和超大型是互斥的.
理想情况下,我希望这些值连接成每个产品的单个VARCHAR("22,21,25"等).
如何在SQL Server 2005中实现这一目标？
谢谢
WITH
data (ProductId, ProductOptionGroupId, ProductOptionId) AS (
/* defining sample data */
SELECT 26, 1, 13 UNION ALL
SELECT 26, 1, 12 UNION ALL
SELECT 44, 1, 22 UNION ALL
SELECT 44, 1, 23 UNION ALL
SELECT 44, 2, 20 UNION ALL
SELECT 44, 2, 21 UNION ALL
SELECT 44, 3, 25 UNION ALL
SELECT 44, 3, 24
),
ranked AS (
/* ranking the group IDs */
SELECT
ProductId,
ProductOptionGroupId,
ProductOptionId,
GroupRank = DENSE_RANK() OVER (PARTITION BY ProductId
ORDER BY ProductOptionGroupId)
FROM data
),
crossjoined AS (
/* obtaining all possible combinations */
SELECT
ProductId,
GroupRank,
ProductVariant = CAST(ProductOptionId AS varchar(250))
FROM ranked
WHERE GroupRank = 1
UNION ALL
SELECT
r.ProductId,
r.GroupRank,
ProductVariant = CAST(c.ProductVariant + ','
+ CAST(r.ProductOptionId AS varchar(10)) AS varchar(250))
FROM ranked r
INNER JOIN crossjoined c ON r.ProductId = c.ProductId
AND r.GroupRank = c.GroupRank + 1
),
maxranks AS (
/* getting the maximum group rank value for every product */
SELECT
ProductId,
MaxRank = MAX(GroupRank)
FROM ranked
GROUP BY ProductId
)
/* getting the max ranked combinations for every product */
SELECT c.ProductId, c.ProductVariant
FROM crossjoined c
INNER JOIN maxranks m ON c.ProductId = m.ProductId
AND c.GroupRank = m.MaxRank
输出:
ProductId ProductVariant
----------- --------------
26 12
26 13
44 22,20,24
44 22,20,25
44 22,21,24
44 22,21,25
44 23,20,24
44 23,20,25
44 23,21,24
44 23,21,25
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