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Nakul Vachhrajani is a Technical Specialist & Systems development professional with iGATE. He holds a MCTS (SQL Server 2008: Implementation & Maintenance)
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#0338 - SQL Server - Recursive CTE - Script to generate a simple multiplication table

May 22 2014 12:00AM by Nakul Vachhrajani   

I was explaining recursive CTEs recently, and had to come up with a practical example for the CTE implementation. One of the first use cases that came to mind was the creation of a simple multiplication table. Now that the script is created, I thought that you may also find it useful sometime in the future.

USE tempdb;
GO

--Generate basic mathematical tables using Recursive CTE
DECLARE @inputValue INT = 2;
DECLARE @targetMultiplicationFactor INT = 20;

--Define the CTE to generate a mathematical table
;WITH GenerateTablesCTE (Input, MultiplicationFactor, Result)
AS 
(
    --Anchor member
    SELECT @inputValue AS Input, 
            1 AS MultiplicationFactor, 
            (@inputValue * 1) AS Result
    UNION ALL
    --Recursive member
    SELECT @inputValue AS Input, 
            (gtCTE.MultiplicationFactor + 1) AS MultiplicationFactor,
            (@inputValue * (gtCTE.MultiplicationFactor + 1)) AS Result
    FROM GenerateTablesCTE AS gtCTE
    WHERE gtCTE.MultiplicationFactor < @targetMultiplicationFactor
)
SELECT ogtCTE.Input,
        ogtCTE.MultiplicationFactor,
        ogtCTE.Result
FROM GenerateTablesCTE AS ogtCTE;
GO

Here’s the result:

image

This script can be used to populate a tally/look-up table.

Further Reading

  • Multiplication Table [Wikipedia Link]

Until we meet next time,

Be courteous. Drive responsibly.

Tags: #SQLServer, SQL Server, Development, T-SQL, #TSQL, Guidance, Tips


Nakul Vachhrajani
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1  Comments  

  • Ooooo, be careful. Using rCTEs to count is as bad as or worse than any While loop to accomplish the same thing. They're real resource hogs, to boot. Please see the following article before you even think of using an rCTE that counts or does similar RBAR things. And, yeah... it's RBAR as you'll see in the article. link text

    commented on May 22 2014 12:58AM
    Jeff Moden
    161 · 1% · 306

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"#0338 - SQL Server - Recursive CTE - Script to generate a simple multiplication table" rated 5 out of 5 by 3 readers
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