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Help with INSERT

Author

Topic

iqmcl
Starting Member

8 Posts

Posted - 2010-03-03 : 11:48:45

Hi,

I have a table which looks like this;

OrderID,ProductId,Qty
=====================
00001,1,4
00001,2,1
00001,3,2

So the same order has 4 x product 1, 1 x product 2 and 2 x product 3.

What I need to do is insert records into another table (based on the Qty field), so;

OrderId,ProductId
=================
000001,1
000001,1
000001,1
000001,1
000001,2
000001,3
000001,3

Can anyone help me out with this, I am not entirely sure of the best/cleanest approach!

Thanks

Chris

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2010-03-03 : 11:52:19

[code]
INSERT INTO Table2 (OrderID,ProductId)
SELECT t1.OrderID,t1.ProductId
FROM Table1 t1
CROSS JOIN master..spt_values v
WHERE v.type='p'
AND v.number BETWEEN 1 AND t1.Qty
[/code]

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

ms65g
Constraint Violating Yak Guru

497 Posts

Posted - 2010-03-03 : 19:08:32

[code]INSERT INTO Table2 (OrderID,ProductId)
SELECT t.OrderID,t.ProductId
FROM Table1 T
JOIN (SELECT ROW_NUMBER() OVER(ORDER BY (SELECT 1))
FROM (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D0(i)
CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D1(i)
CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D2(i)
CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D3(i)
CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D4(i)
CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D5(i)
CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D6(i)
CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D7(i)
CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D8(i)
CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D9(i)
CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D10(i)) D(n)
ON D.n <= T.Qty
[/code]

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2010-03-04 : 02:31:00

quote:

Originally posted by ms65g

INSERT INTO Table2 (OrderID,ProductId)
SELECT t.OrderID,t.ProductId
  FROM Table1 T
  JOIN (SELECT ROW_NUMBER() OVER(ORDER BY (SELECT 1))
          FROM (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D0(i)
         CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D1(i)
         CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D2(i)
         CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D3(i)
         CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D4(i)
         CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D5(i)
         CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D6(i)
         CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D7(i)
         CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D8(i)
         CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D9(i)
         CROSS JOIN (SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3) D10(i)) D(n)
    ON D.n <= T.Qty

It is better to have a number table and cross join with it. If you generate numbers on the fly it may cause performance issues for large set of data

Madhivanan

Failing to plan is Planning to fail

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