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Editorial Team
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Asked: 2026-06-17T08:18:23+00:00

I’ve got a field in this database that stores number like so: 80 1/4

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I’ve got a field in this database that stores number like so:

  • 80 1/4
  • 20 1/8
  • 20
  • 36 15/16
  • 44 1/8
  • 93 7/8
  • 89 1/8

I’m trying to convert these to a full decimal so I can add them up. I’ve been trying to do this by extracting the fraction out of the number, converting that to a decimal and then adding that to the whole number. I’ve been having some major problems extracting the numerator. The denominator has been extracted using:

CASE WHEN CHARINDEX('/',Fraction) > 0 THEN RIGHT(Faction,(LEN(Fraction) - (CHARINDEX('/',Fraction)))) ELSE NULL END AS [Denominator]

I’m not sure if that’s the most efficient way to do it but it seems to work.

I’ve tried to pull the numerator out using this method:

CASE WHEN Charindex('/', Fraction) > 0 THEN LEFT(RIGHT(Fraction, Len(Fraction) - Charindex(' ',Fraction)), CHARINDEX('/',Fraction) - 1) ELSE NULL END AS [Numerator]

But that just gives me the fraction itself. I’m not sure if SQL has a problem with a RIGHT inside a LEFT since it doesn’t seem to do anything, or, more likely, my code is messed up.

Anyone have any ideas?

Thanks!

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1 Answer

  1. Editorial Team

    You almost got it right: you are calculating the length that you pass to LEFT incorrectly. You need to take the position of space into account.

    Instead of

    CHARINDEX('/',Fraction) - 1

    the length should be

    CHARINDEX('/',Fraction) - CHARINDEX(' ',Fraction) - 1

    The overall expression should look like this:

    CASE WHEN Charindex('/', Fraction) > 0 THEN LEFT(RIGHT(Fraction, Len(Fraction) - Charindex(' ',Fraction)), CHARINDEX('/',Fraction) - CHARINDEX(' ',Fraction) - 1) ELSE NULL END AS [Numerator]

    Link to demo on sqlfiddle.

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