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Editorial Team
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Asked: 2026-06-02T19:02:57+00:00

I have a table containing columns id (int), logical expression (varchar) and result (bit).

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I have a table containing columns id(int), logical expression(varchar) and result(bit). The logical expression is stored in a varchar which I need to evaluate and put the result into the result column. For example, the column could contain: 

'1=1'
'2<3 AND 1^1=1'
'3>4 OR 4<2'

The result column should then contain 

1
0
0

Currently I am using a cursor to navigate the rows and using dynamic sql to evaluate the expression. 

"IF(" + @expression + ") SET @result = 1"

Is there a better, more efficient way to do this? I would ideally like to get rid of the cursor. Any ideas? Would this be better performed using an assembly?

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1 Answer

  1. Editorial Team

    I’d go with a CLR.

    I posted a very similar answer here: Convert string with expression to decimal

    infact, the above answer would work fine unmodified for (and any other simple expressions):

    SELECT dbo.eval('1=1' )
SELECT dbo.eval('3>4 OR 4<2' )

    However, it would fail for the one using the ^ (caret) operator – you would need to tweak the CLR to handle the bitwise XOR.

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