SQL: iterating through a list that contains some ranges - sql-server

Question

I am trying to get information for products that have an ID that is contained in a list. The problem is that the list contains some single values and some range values:
PX03 - PX069, PX20, PX202, PX25 - PX270, PX250 - PX2509, PX251, PX2511 -
PX2513
Basically what I am looking for is some way to take a list or string containing both values and ranges and the end output is a table or list that has all of the values within the ranges individually so that I can loop through them.
I have a stored procedure that loops through all the ID's in the main products table that use the 'PX' prefix, but the table has all ids (i.e. PX 1 - 9999, LX 00001 - 99999) and I only want to search through those contained in the above list. I could write it out all the id's individually but some of the ranges contain many values, which would be time consuming to go through.
My idea was to create a separate table containing this list, in which there would be three columns: an identity column, and then one column each for the beginning and end of the range. Any items that do not have a range would just have the same value for beginning and end range, i.e.:
----------------------------------
rownum | range_start | range_end|
----------------------------------
1 PX03 PX069
2 PX20 PX20
3 PX202 PX202
4 PX25 PX25
5 PX250 PX2509
and then populating a table using something like:
SELECT id from product_table
WHERE id BETWEEN listtable.range_start AND listtable.range_end
where product_table is my original table with the product id's and their information and listtable is the new table I just created. This would give me:
id|
---
PX03
PX030
PX031
PX032
PX033
.
.
.
PX067
PX068
PX069
PX20
PX202
PX25
PX250
PX251
etc.
but I am thinking I would need to iterate through the list and I am not sure how to do that. Any ideas, hints or suggestions?
UPDATE
After creating the table using the solution given by #asantaballa, it was as simple as using an inner join:
SELECT d.id
FROM product_table d
INNER JOIN #RangeTable r
ON d.id BETWEEN r.RangeFrom AND r.RangeTo

Answer 1

See if this works for you for the part about converting the string to a table.
Declare #StrList Varchar(1000) = 'PX03 - PX069, PX20, PX202, PX25 - PX270, PX250 - PX2509, PX251, PX2511 - PX2513'
Declare #RangeTable Table (RangeFrom VarChar(32), RangeTo VarChar(32))
Select #StrList = Replace(#StrList,' ', '') + ','
Declare #StrListItem Varchar(32)
While CHARINDEX(',', #StrList) > 0
Begin
Select #StrListItem = SUBSTRING(#StrList,1,CHARINDEX(',', #StrList) - 1)
Declare
#RangeFrom VarChar(32)
, #RangeTo VarChar(32)
If CHARINDEX('-', #StrListItem) = 0
Begin
Select
#RangeFrom = #StrListItem
, #RangeTo = #StrListItem
End
Else
Begin
Select
#RangeFrom = SUBSTRING(#StrListItem, 1, CHARINDEX('-', #StrListItem) - 1)
, #RangeTo = SUBSTRING(#StrListItem, CHARINDEX('-', #StrListItem) + 1, LEN(#StrListItem) - CHARINDEX('-', #StrListItem))
End
Insert Into #RangeTable (RangeFrom, RangeTo) Values (#RangeFrom, #RangeTo)
Select #StrList = SUBSTRING(#StrList, CHARINDEX(',', #StrList) + 1, LEN(#StrList) - CHARINDEX(',', #StrList))
End
Select * From #RangeTable

Answer 2

Here is your string and product_table
DECLARE #STR VARCHAR(100) = 'PX03 - PX069, PX20, PX202, PX25 - PX270, PX250 - PX2509, PX251, PX2511 - PX2513'
SELECT * INTO #product_table
FROM
(
SELECT 'PX4' PRODID
UNION ALL
SELECT 'PX26'
UNION ALL
SELECT 'PX75'
UNION ALL
SELECT 'PX77'
)TAB
Now create a table to hold the value
CREATE TABLE #listtable(ROWNUM int IDENTITY(1,1),range_start VARCHAR(100),range_end VARCHAR(100))
Now insert the splitted value to the table.
INSERT INTO #listtable
SELECT
ISNULL(PARSENAME(REPLACE(Split.a.value('.', 'VARCHAR(100)'),'-','.'),2),Split.a.value('.', 'VARCHAR(100)')) 'range_start' ,
PARSENAME(REPLACE(Split.a.value('.', 'VARCHAR(100)'),'-','.'),1) 'range_end'
FROM
(
SELECT CAST ('<M>' + REPLACE(#STR, ',', '</M><M>') + '</M>' AS XML) AS Data
) AS A
CROSS APPLY Data.nodes ('/M') AS Split(a)
Since Id is string, you need a function to extract numbers from Id(function created by God of SQL Server - Pinal Dave)
CREATE FUNCTION dbo.udf_GetNumeric
(#strAlphaNumeric VARCHAR(256))
RETURNS VARCHAR(256)
AS
BEGIN
DECLARE #intAlpha INT
SET #intAlpha = PATINDEX('%[^0-9]%', #strAlphaNumeric)
BEGIN
WHILE #intAlpha > 0
BEGIN
SET #strAlphaNumeric = STUFF(#strAlphaNumeric, #intAlpha, 1, '' )
SET #intAlpha = PATINDEX('%[^0-9]%', #strAlphaNumeric )
END
END
RETURN ISNULL(#strAlphaNumeric,0)
END
First of all keep in mind that we will not get PX1,PX2,PX3,PX4 if you give id BETWEEN listtable.range_start AND listtable.range_end because those are of varchar type and not numbers. So we need to extract numbers from each PX and get the values between them and append PX.
Here is the query which filters the IDs in product_table which are in the range between listtable
;WITH CTE AS
(
SELECT ROWNUM,CAST(dbo.udf_GetNumeric(range_start)AS INT) NUMBERS,
CAST(dbo.udf_GetNumeric(range_end)AS INT) RTO1
FROM #listtable
UNION ALL
SELECT T.ROWNUM,NUMBERS+1,RTO1
FROM #listtable T
JOIN CTE ON CTE.ROWNUM = T.ROWNUM
WHERE NUMBERS < RTO1
)
SELECT PRODID IDS--,ROWNUM,NUMBERS NUMS,'PX'+CAST(NUMBERS AS VARCHAR(10)) IDS2
FROM CTE
JOIN #product_table ON PRODID='PX'+CAST(NUMBERS AS VARCHAR(10))
ORDER BY NUMBERS
option (MaxRecursion 0)
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