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oracle varchar to number

How do i convert a oracle varchar value to number

eg

table - exception
exception_value 555 where exception_value is a varchar type

I would like to test the value of exception_value column

select * from exception where exception_value = 105 instead of
select * from exception where exception_value = '105'
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by (71.8m points)

You have to use the TO_NUMBER function:

select * from exception where exception_value = to_number('105')

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