Question

I’m using SQLServer 2008.

Say I have a recursive hierarchy table, SalesRegion, whit SalesRegionId and ParentSalesRegionId. What I need is, given a specific SalesRegion (anywhere in the hierarchy), retrieve ALL the records at the BOTTOM level.

I.E.:
SalesRegion, ParentSalesRegionId

1, null

1-1, 1

1-2, 1

1-1-1, 1-1

1-1-2, 1-1

1-2-1, 1-2

1-2-2, 1-2

1-1-1-1, 1-1-1

1-1-1-2, 1-1-1

1-1-2-1, 1-1-2

1-2-1-1, 1-2-1

(in my table I have sequencial numbers, this dashed numbers are only to be clear)

So, if the user enters 1-1, I need to retrieve al records with SalesRegion 1-1-1-1 or 1-1-1-2 or 1-1-2-1 (and NOT 1-2-2). Similarly, if the user enters 1-1-2-1, I need to retrieve just 1-1-2-1

I have a CTE query that retrieves everything below 1-1, but that includes rows that I don’t want:

WITH SaleLocale_CTE AS (
    SELECT SL.SaleLocaleId, SL.SaleLocaleName, SL.AccountingLocationID, SL.LocaleTypeId, SL.ParentSaleLocaleId, 1 AS Level /*Added as a workaround*/
      FROM SaleLocale SL
     WHERE SL.Deleted = 0
       AND (@SaleLocaleId IS NULL OR SaleLocaleId = @SaleLocaleId)
     UNION ALL
    SELECT SL.SaleLocaleId, SL.SaleLocaleName, SL.AccountingLocationID, SL.LocaleTypeId, SL.ParentSaleLocaleId, Level + 1 AS Level
      FROM SaleLocale SL
           INNER JOIN SaleLocale_CTE SLCTE ON SLCTE.SaleLocaleId = SL.ParentSaleLocaleId
     WHERE SL.Deleted = 0
)
SELECT *
FROM SaleLocale_CTE

Thanks in advance!

Alejandro.

Answer 1

I found a quick way to do this, but I’d rather the answer to be in a single query. So if you can think of one, please share! If I like it better, I’ll vote for it as the best answer.

I added a “Level” column in my previous query (I’ll edit the question so this answer is clear), and used it to get the last level and then delete the ones I don’t need.

INSERT INTO @SaleLocales
    SELECT *
      FROM SaleLocale_GetChilds(@SaleLocaleId)

SELECT @LowestLevel = MAX(Level)
  FROM @SaleLocales

DELETE @SaleLocales
 WHERE Level <> @LowestLevel