DigitsOnlyEE and AlphaNumericOnly
A nasty fast way to remove non-numeric and non-alphanumeric characters from a string
2019-03-15 (first published: 2016-05-17)
3,063 reads
CREATE FUNCTION dbo.GetNumsAB ( @low bigint, @high bigint, @gap bigint, @row1 bit ) /**************************************************************************************** Purpose: Creates up to 100,544,625 sequential numbers beginning with @low and ending with @high. Used to replace iterative methods such as loops, cursors and recursive CTEs to solve SQL problems. Based on Itzik Ben-Gan's getnums function with some tweeks and enhancements and added functionality. The logic for getting rn to begin at 0 or 1 is based comes from Jeff Moden's fnTally function. Compatibility: SQL Server 2008+ and Azure SQL Database Syntax: SELECT rn, n1, n2 FROM dbo.getnumsAB(@low,@high,@gap,@row1); Parameters: @low = a bigint that represents the lowest value for n1. @high = a bigint that represents the highest value for n1. @gap = a bigint that represents how much n1 and n2 will increase each row; @gap also represents the difference between n1 and n2. @row1 = a bit that represents the first value of rn. When @row = 0 then rn begins at 0, when @row = 1 then rn will begin at 1. Return Types: Inline Table Valued Function returns: rn = bigint; a row number that works just like T-SQL ROW_NUMBER() except that it can start at 0 or 1 which is dictated by @row1. n1 = bigint; a sequential number starting at the value of @low and incrimentingby the value of @gap until it is less than or equal to the value of @high. n2 = bigint; a sequential number starting at the value of @low+@gap and incrimenting by the value of @gap. Developer Notes: 1. The lowest and highest possible numbers returned are whatever is allowable by a bigint. The function, however, returns no more than 100,544,625 rows (465^3). 2. @gap does not affect rn, rn will begin at @row1 and increase by 1 until the last row unless its used in a query where a filter is applied to rn. 3. @gap must be greater than 0 or the function will not return any rows. 4. Keep in mind that when @row1 is 0 then the highest row-number will be the number of rows returned minus 1 5. If you only need is a sequential set beginning at 0 or 1 then, for best performance use the RN column. Use N1 and/or N2 when you need to begin your sequence at any number other than 0 or 1 or if you need a gap between your sequence of numbers. 6. Although @gap is a bigint it must be a positive integer or the function will not return any rows. 7. @high must be equal or higher than @low or the function won't return any rows. 8. There is no performance penalty for sorting by rn ASC; there is a large performance penalty for sorting in descending order. To sort in descending order, first make sure that @gap = 1. Next create an alias column (called "n_desc" in the example below) and use the formula: n_desc = ABS(rn-(@high+1)). The example below will return the numbers 1 to 10 in descending order: DECLARE @low int = 1, @high int = 10, @gap int = 1, @row1 bit = 1; SELECT n_desc = ABS(rn-(@high+(@row1))) FROM dbo.getnumsAB(@low,@high,1,@ro1) ORDER BY rn; Examples: --===== 1. Using RN (rownumber) -- (1.1) The best way to get the numbers 1,2,3...@high (e.g. 1 to 5): SELECT RN FROM dbo.getnumsAB(1,5,1,1); -- (1.2) The best way to get the numbers 0,1,2...@high-1 (e.g. 0 to 5): SELECT RN FROM dbo.getnumsAB(0,5,1,0); --===== 2. Using N1 -- (2.1) To begin with numbers other than 0 or 1 use N1 (e.g. -3 to 3): SELECT N1 FROM dbo.getnumsAB(-3,3,1,1); -- (2.2) ROW_NUMBER() is built in. If you want a ROW_NUMBER() include RN: SELECT RN, N1 FROM dbo.getnumsAB(-3,3,1,1); -- (2.3) If you wanted a ROW_NUMBER() that started at 0 you would do this: SELECT RN, N1 FROM dbo.getnumsAB(-3,3,1,0); --===== 3. Using N2 and @gap -- (3.1) To get 0,10,20,30...100, set @low to 0, @high to 100 and @gap to 10: SELECT N1 FROM dbo.getnumsAB(0,100,10,1); -- (3.2) Note that N2=N1+@gap; this allows you to create a sequence of ranges. -- For example, to get (0,10),(10,20),(20,30).... (90,100): SELECT N1, N2 FROM dbo.getnumsAB(0,90,10,1); -- (3.3) Remember that a rownumber is included and it can begin at 0 or 1: SELECT RN, N1, N2 FROM dbo.getnumsAB(0,90,10,1); --===== (4) A real life example using RN, N1 and N2: -- Beginning with @StartDate, to generate ranges of weeks that occur between -- @startDate & @EndDate: DECLARE @StartDate datetime = '1/1/2015', @EndDate datetime = '2/28/2015'; SELECT WeekNbr = 'Week #'+CAST(RN AS varchar(2)), WeekStart = CONVERT(DATE, DATEADD(DAY,N1,@StartDate)), WeekEnd = CONVERT(DATE, DATEADD(DAY,N2-1,@StartDate)) FROM dbo.getnumsAB(0,datediff(DAY,@StartDate,@EndDate),7,1); --------------------------------------------------------------------------------------- Revision History: Rev 00 - 20140518 - Initial Development - Alan Burstein Rev 01 - 20151029 - Added 65 rows to make L1=465; 465^3=100.5M. Updated comment section - Alan Burstein ****************************************************************************************/RETURNS TABLE WITH SCHEMABINDING AS RETURN WITH L1(N) AS ( SELECT 1 FROM (VALUES (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL), (NULL),(NULL),(NULL)) t(N) -- 465 values ), iTally AS ( SELECT rn = 0 WHERE @row1 = 0 UNION ALL SELECT rn = ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM L1 a CROSS APPLY L1 b CROSS APPLY L1 c ) --Up to 100,544,625 numbers (select 465*465*465 = 100,544,625) SELECT TOP (ABS((@high-@low)/ISNULL(NULLIF(@gap,0),1)+1)) rn, n1 = ((rn-( @row1 ))*@gap+@low), n2 = ((rn-(@row1-1))*@gap+@low) FROM iTally WHERE @high >= @low and @gap > 0 ORDER BY rn;