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Help with SQL Query

Posted on 2013-05-10
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Last Modified: 2013-05-10
Experts,

Details have been attached. Please correct/update my script

Thanks in advance
Details.docx
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Question by:Tpaul_10
7 Comments
 
LVL 48

Expert Comment

by:PortletPaul
ID: 39156343
SELECT
      I.ItemID
    , I.NAME
    , max(CASE WHEN d.discountID = 1 THEN 'Discount 1' END) AS d1
    , max(CASE WHEN d.discountID = 1 AND d.discount = 0 THEN 'No' ELSE 'Yes' END) 'discount1'
    , max(CASE WHEN d.discountID = 2 THEN 'Discount 2' END) AS d2
    , max(CASE WHEN d.discountID = 2 AND d.discount = 0 THEN 'No' ELSE 'Yes' END) 'discount2'
    , max(CASE WHEN d.discountID = 3 THEN 'Discount 3' END) AS d3
    , max(CASE WHEN d.discountID = 3 AND d.discount = 0 THEN 'No' ELSE 'Yes' END) 'discount3'
    , max(CASE WHEN d.discountID = 4 THEN 'Discount 4' END) AS d4
    , max(CASE WHEN d.discountID = 4 AND d.discount = 0 THEN 'No' ELSE 'Yes' END) 'discount4'
    , max(CASE WHEN d.discountID = 5 THEN 'Discount 5' END) AS d5
    , max(CASE WHEN d.discountID = 5 AND d.discount = 0 THEN 'No' ELSE 'Yes' END) 'discount5'
FROM Database1.dbo.Item I
INNER JOIN database2.dbo.discount d ON I.itemID = d.Itemid
WHERE P.Product = 'Product 1'
GROUP BY I.ItemID
    , I.NAME

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0
 
LVL 48

Expert Comment

by:PortletPaul
ID: 39156372
actually, I think this would work without needing the group by:
SELECT
      I.ItemID
    , I.NAME
    , 'Discount 1' AS d1
    , CASE WHEN d.discountID = 1 AND d.discount = 1 THEN 'Yes' ELSE 'NO' END 'discount1'
    , 'Discount 2' AS d2
    , CASE WHEN d.discountID = 2 AND d.discount = 1 THEN 'Yes' ELSE 'NO' END 'discount2'
    , 'Discount 3' AS d3
    , CASE WHEN d.discountID = 3 AND d.discount = 1 THEN 'Yes' ELSE 'NO' END 'discount3'
    , 'Discount 4' AS d4
    , CASE WHEN d.discountID = 4 AND d.discount = 1 THEN 'Yes' ELSE 'NO' END 'discount4'
    , 'Discount 5' AS d5
    , CASE WHEN d.discountID = 5 AND d.discount = 1 THEN 'Yes' ELSE 'NO' END 'discount5'
FROM Database1.dbo.Item I
INNER JOIN database2.dbo.discount d ON I.itemID = d.Itemid
WHERE P.Product = 'Product 1'
ORDER BY
      I.ItemID

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{+ edit test for 1 instead of 0, correction)
0
 
LVL 9

Expert Comment

by:Beartlaoi
ID: 39156436
This one gives you one row per distinct item and gives dynamic columns based on what discounts you have:
DECLARE @cols AS NVARCHAR(MAX),
    @query  AS NVARCHAR(MAX);

SET @cols = STUFF((
	SELECT distinct ', [Discount ' + CONVERT(varchar(10),DiscountID) + ' Type]=''Discount ' + CONVERT(varchar(10),DiscountID) + ''', 
	[Discount ' + CONVERT(varchar(10),DiscountID) + ']=(SELECT CASE Discount WHEN 1 THEN ''Yes'' ELSE ''No'' END FROM database2.dbo.Discount d WHERE d.ItemId=I.ItemId AND d.DiscountID=' + CONVERT(varchar(10),DiscountID) + ')'
	FROM Discount
    FOR XML PATH(''), TYPE
    ).value('.', 'NVARCHAR(MAX)') 
    ,1,1,'')

set @query = 'SELECT ItemId, ItemName,' + @cols + ' FROM Database1.dbo.Item I WHERE P.Product = ''Product 1''' 
execute(@query)

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LVL 30

Accepted Solution

by:
Rich Weissler earned 400 total points
ID: 39156559
Overkill, but playing with PIVOT, just 'cause...

select  ItemID, ItemName, [1] as [Discount 1], [2] as [Discount 2],[3] as [Discount 3], [4] as [Discount 4], [5] as [Discount 5] from
(
   Select  i.itemid, i.itemname, d.discountid, case d.discount when 0 then 'No' when 1 then 'Yes' end as discount
     from item i 
     join discount d on i.itemid = d.itemid
 ) ItemDiscount
PIVOT (
   max(discount)
   FOR discountid IN ([1],[2],[3],[4],[5])
 ) as outputtable

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I personally think it's a little cleaner because it moves the Discount 1, Discount 2, etc out of the rows and into the columns and gives a single column for each discount.  I apologize in advance if that was undesirable.
0
 
LVL 9

Assisted Solution

by:Beartlaoi
Beartlaoi earned 100 total points
ID: 39156683
If you want the one column per discount layout, here is a dynamic pivot
DECLARE @cols1 AS NVARCHAR(MAX), @cols2 AS NVARCHAR(MAX),
    @query  AS NVARCHAR(MAX);

SET @cols1 = STUFF((
	SELECT distinct ', [' + CONVERT(varchar(10),DiscountID) + '] as [Discount ' + CONVERT(varchar(10),DiscountID) + ']'
	FROM database2.dbo.Discount
    FOR XML PATH(''), TYPE
    ).value('.', 'NVARCHAR(MAX)') 
    ,1,1,'')

SET @cols2 = STUFF((
	SELECT distinct ', [' + CONVERT(varchar(10),DiscountID) + ']'
	FROM database2.dbo.Discount
    FOR XML PATH(''), TYPE
    ).value('.', 'NVARCHAR(MAX)') 
    ,1,1,'')

set @query = 'SELECT ItemId, ItemName, ' + @cols1 + ' FROM (
SELECT  I.ItemId, I.ItemName, d.DiscountID, CASE d.Discount WHEN 1 THEN ''Yes'' ELSE ''No'' END as Disc
FROM Database1.dbo.Item I INNER JOIN database2.dbo.Discount d ON I.ItemId = d.ItemId) pv
PIVOT (
   MAX(Disc)
   FOR DiscountID IN (' + @cols2 + ')
 ) AS ItemDiscounts' 
execute(@query)

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0
 

Author Comment

by:Tpaul_10
ID: 39156969
Sincere THANKS to all of you for your quick response. here are the details after I have tried everything.

PortletPaul
Order by didn't work since it was returning  five rows per the item
Group by worked based on total no.of rows I was expecting, but the discount data for all of the items says or return as "Yes"

Beartlaoi
Your last script is working and getting the correct results, but is there any way I can re-name the columns (as an example Discount 1 as Clarence, Discount 2 as Closeout etc)

Razmus
No issues with your script and working good with the correct results and looks simple too.

THANKS again guys.
Have a good day
0
 
LVL 9

Expert Comment

by:Beartlaoi
ID: 39157160
Yes, Lets create a DiscountNames table in the same database as the Discount table where you can set the names of the discounts without editing the SQL every time you change them.

CREATE TABLE database2.dbo.DiscountNames]( [DiscountID] [int] NOT NULL, [DiscountName] [varchar](50) NOT NULL), CONSTRAINT [PK_DiscountNames] PRIMARY KEY CLUSTERED ([DiscountID] ASC)

Fill it in (for example):
DiscountID      DiscountName
1      Clearence
2      Closeout
3      Employee
4      Military
5      Student
6      Senior
7      Coupon

DECLARE @cols1 AS NVARCHAR(MAX), @cols2 AS NVARCHAR(MAX),
    @query  AS NVARCHAR(MAX);

SET @cols1 = STUFF((
	SELECT distinct ', [' + CONVERT(varchar(10),d.DiscountID) + '] as [' + ISNULL(dn.DiscountName, 'Discount ' + CONVERT(varchar(10),d.DiscountID)) + ']'
	FROM database2.dbo.Discount d LEFT JOIN database2.dbo.DiscountNames dn ON dn.DiscountID=d.DiscountID
    FOR XML PATH(''), TYPE
    ).value('.', 'NVARCHAR(MAX)') 
    ,1,1,'')

SET @cols2 = STUFF((
	SELECT distinct ', [' + CONVERT(varchar(10),DiscountID) + ']'
	FROM database2.dbo.Discount
    FOR XML PATH(''), TYPE
    ).value('.', 'NVARCHAR(MAX)') 
    ,1,1,'')

set @query = 'SELECT ItemId, ItemName, ' + @cols1 + ' FROM (
SELECT  I.ItemId, I.ItemName, d.DiscountID, CASE d.Discount WHEN 1 THEN ''Yes'' ELSE ''No'' END as Disc
FROM Database1.dbo.Item I INNER JOIN database2.dbo.Discount d ON I.ItemId = d.ItemId) pv
PIVOT (
   MAX(Disc)
   FOR DiscountID IN (' + @cols2 + ')
 ) AS ItemDiscounts' 
execute(@query)

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If you add a discount without a name then you will get the old Discount # label.
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