插入一排，根據領域重視

Question

我的數據是這樣的

Supplier Qty 
-------- --- 
ABC  3 
BCD  1 
CDE  2 
DEF  1 

我希望得到的結果是：

Supplier Qty 
-------- --- 
ABC  3 }---> Add additional row based on the number of qty 
ABC  3 } 
ABC  3 } 
BCD  1 
CDE  2 }---> Add additional row here too 
CDE  2 } 
DEF  1 

尋找執行的預期結果的SQL SELECT語句。
我正在使用Sql Server 2008

Answer 1

DECLARE @d TABLE (Supplier VARCHAR(32), Quantity INT); 

INSERT @d SELECT 'ABC',3 
UNION ALL SELECT 'BCD',1 
UNION ALL SELECT 'CDE',2 
UNION ALL SELECT 'DEF',1; 

WITH x AS 
(
    SELECT TOP (10) rn = ROW_NUMBER() --since OP stated max = 10 
    OVER (ORDER BY [object_id]) 
    FROM sys.all_columns 
    ORDER BY [object_id] 
) 
SELECT d.Supplier, d.Quantity 
FROM x 
CROSS JOIN @d AS d 
WHERE x.rn <= d.Quantity 
ORDER BY d.Supplier; 

Answer 2

絕不是最漂亮的東西;並假設數量將永遠不會超過10. 有更好的方法來做到這一點...但涉及PL \ SQL或T-SQL不能想到一個直接的SQL答案。

Insert into yourTablename 
(
(Select supplier, Qty From YourTableName where Qty-1 > 0) 
UNION 
(Select supplier, Qty From YourTableName where Qty-2 > 0) 
UNION 
(Select supplier, Qty From YourTableName where Qty-3 > 0) 
UNION 
(Select supplier, Qty From YourTableName where Qty-4 > 0) 
UNION 
(Select supplier, Qty From YourTableName where Qty-5 > 0) 
UNION 
(Select supplier, Qty From YourTableName where Qty-6 > 0) 
UNION 
(Select supplier, Qty From YourTableName where Qty-7 > 0) 
UNION 
(Select supplier, Qty From YourTableName where Qty-8 > 0) 
UNION 
(Select supplier, Qty From YourTableName where Qty-9 > 0) 
UNION 
(Select supplier, Qty From YourTableName where Qty-10 > 0) 
) 

此外，這是一筆交易;如果這不是第一次;你必須清理數據然後重試。 （又不是我最喜歡的答案，但限制只SQL ...）

Answer 3

假設你將回到同一個表，使用CTE找出行插入乾淨的作品。這將而不是工作，如果數量大於最大遞歸級別（我相信是默認爲100），因此可能不是一個合適的解決方案。

;WITH SupplyToInsert (Supplier, Qty) AS (
    SELECT Supplier, Qty - 1 
    FROM Supply 
    WHERE Qty > 1 

    UNION ALL 

    SELECT S.Supplier, I.Qty - 1 
    FROM Supply S 
     INNER JOIN SupplyToInsert I ON I.Supplier = S.Supplier 
    WHERE I.Qty > 1 
) 
INSERT INTO Supply (Supplier, Qty) 
SELECT I.Supplier, S.Qty 
FROM SupplyToInsert I 
    INNER JOIN Supply S ON S.Supplier = I.Supplier 

如果你的arent將回到同一個表，改變每個Qty > 1到Qty > 0在CTE，以獲得一個額外的行每個供應商。

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