Question

Iv’e got a SQL query that I hope you can help me figure out.

This should be easy, My head is just not producing today.

Here is a sample of the tables

TblProducts

ID | SKU  | Price
-----------------
1  | ABC  | 10.00 
2  | DEF  | 5.00 
3  | OSKD | 6.00
4  | 123  | 6.00
5  | LPD  | 12.00
6  | TRE  | 3.00

TblCategories

ID | Name  | Active |Sort 
-------------------------
1  | Home  | 1      |4 
2  | Garden| 1      |55 
3  | Misc  | 1      |2
4  | Test  | 0      |1

TblAlternateCategoryName

ID | CategoryID | AltName
-------------------------
1  | 1          | House 
2  | 1          | Crib
3  | 3          | Anything

TblProductXCategories

ID | ProductID | CategoryID | SortOrder
---------------------------------------
1  | 1         | 1          | 1
2  | 1         | 2          | 1
4  | 2         | 2          | 4
5  | 2         | 3          | 6
6  | 3         | 3          | 6  
7  | 4         | 4          | 0 
8  | 5         | 2          | 1 

need this result

 SKU  | Price | Category | AlternateCategory
 -------------------------------------------
 ABC  | 10.00 | Home     | House 
 DEF  | 5.00  | Misc     | Anything
 OSKD | 6.00  | Misc     | Anything
 LPD  | 12.00 | Garden   | Null

Rules

1. Return one category per product. (lowest sort)
2. Product Must be in active category.
3. Use AlternateCategory if available but not required.
4. sort could sometimes be duplicate.

Thanks in advance

Here is the original SQL Statment

    DECLARE @feedID int =4
    SELECT Pro_Chl.id, 
       Pro_Chl.sku, 
       Pro_Chl.productname, 
       (SELECT top 1 tbl_componentsettinglist.componentsubtype 
            FROM   tbl_offers 
               INNER JOIN tbl_componentsettinglist 
                       ON tbl_offers.id = tbl_componentsettinglist.componentid 
            WHERE  ( tbl_componentsettinglist.componentsubtype = N'Free Shipping' ) 
               AND ( tbl_componentsettinglist.componenttype = N'Offer' ) 
               AND ( tbl_offers.startdate <= { fn NOW() } ) 
               AND ( tbl_offers.enddate > { fn NOW() } ) 
               AND ( tbl_offers.enabled = 1 ) 
               AND ( Pro_Chl.id = tbl_componentsettinglist.setting1 ) 
            ORDER  BY tbl_offers.[order]) AS FreeShipping, 
       TblCategories.name              AS CategoryName, 
       TblAlternateCategoryName.value     AS FeedCat 
    FROM   TblProducts AS Pro_Chl 
       INNER JOIN (
                            SELECT productid, 
                                      categoryid, 
                                      sortorder 
                               FROM   TblProductXCategories main 
                               WHERE  sortorder = (
                                                       SELECT top 1 Min(srt.sortorder) 
                                                       FROM   TblProductXCategories srt 
                                                              INNER JOIN TblCategories 
                                                                      ON srt.categoryid = 
                                                                             TblCategories.id 
                                                       WHERE  srt.productid = main.productid 
                                                            AND srt.categoryid = main.categoryid 
                                                              AND TblCategories.hidden = 0
                                               )

                    ) 
                     AS PxC

               ON ( Pro_Chl.id = PxC.productid 
                     OR Pro_Chl.parentid = PxC.productid ) 
       INNER JOIN TblCategories 
               ON PxC.categoryid = TblCategories.id 
       LEFT OUTER JOIN TblAlternateCategoryName 
                    ON PxC.categoryid = TblAlternateCategoryName.categoryid AND TblAlternateCategoryName.feedid = @feedID  
    WHERE  (
                     ( Pro_Chl.parentid = '' ) 
                     AND ( Pro_Chl.id NOT IN (SELECT parentid 
                                            FROM   TblProducts AS pc 
                                            WHERE  ( customproperties LIKE '%upc%' )) ) 

                     AND ( Pro_Chl.status = 1 ) 
                     AND ( Pro_Chl.manufacturerid IS NOT NULL ) 
                     AND ( Pro_Chl.manufacturerid <> '' ) 
                     AND ( Pro_Chl.manufacturerid <> '- No Manufacturer -' ) 
                     AND ( Pro_Chl.id NOT IN (SELECT productid 
                                            FROM   TblProductschoicecombinations 
                                            WHERE  available = 0) ) 
                     AND Pro_Chl.manufacturerid NOT IN ( 
                     'f46c9a25-8172-49a8-991a-a8219663453b' ) 
            ) 
            OR 
            (
                     ( Pro_Chl.parentid <> '' ) 
             AND ( Pro_Chl.customproperties LIKE '%upc%' ) 
             AND ( Pro_Chl.parentid IN (SELECT id 
                                            FROM   TblProducts AS cp 
                                            WHERE  ( status = 1 ) 
                                               AND ( parentid = '' )) ) 

             AND ( Pro_Chl.status = 1 ) 
             AND ( Pro_Chl.manufacturerid IS NOT NULL ) 
             AND ( Pro_Chl.manufacturerid <> '' ) 
             AND ( Pro_Chl.manufacturerid <> '- No Manufacturer -' ) 
             AND ( Pro_Chl.id NOT IN (SELECT productid 
                                            FROM   TblProductschoicecombinations 
                                            WHERE  available = 0) ) 
             AND Pro_Chl.manufacturerid NOT IN ( 
                     'f46c9a25-8172-49a8-991a-a8219663453b' 
                                               ) 
              ) 

Answer 1

Here is a SQLFiddle demo. This query selects Category with min(TblCategory.Sort). If you need to select category with min(TblProductXCategories.SortOrder) just replace order by column in OVER statement toTblProductXCategories.SortOrder. It works fine with duplicate sortorders

with t as 
(select TblProductXCategories.*,TblCategories.Name CatName,
 row_number() over (partition by ProductID order by TblCategories.Sort) rownum 
  from TblProductXCategories
   join TblCategories on  TblProductXCategories.CategoryId = TblCategories.id 
         and TblCategories.Active=1 
 )
select TblProducts.SKU,TblProducts.Price,t.CatName,

(select top 1 AltName from TblAlternateCategoryName 
   where TblAlternateCategoryName.CategoryId=t.CategoryId order by Id )
from t 
left join TblProducts on t.productid=TblProducts.id
where rownum=1

or an equivalent without WITH. SQLFiddle:

select TblProducts.SKU,TblProducts.Price,t.CatName,
(select top 1 AltName 
        from TblAlternateCategoryName 
        where TblAlternateCategoryName.CategoryId=t.CategoryId 
        order by Id ) AltCat

from

(select TblProductXCategories.*,
        TblCategories.Name CatName,
        row_number() 
         over (partition by ProductID order by TblCategories.Sort) rownum 
 from TblProductXCategories
 join TblCategories  on  TblProductXCategories.CategoryId = TblCategories.id 
       and TblCategories.Active=1 
) t

left join TblProducts on t.productid=TblProducts.id
where rownum=1