date - Keep 2 years of records in table when reference column is in a string format -

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i want keep 2 years of records in table client wants keep reference column(referenceperiod) in string format.

so it's working when column in date format:

delete
dbo.gsufverification_testmylene
referenceperiod < dateadd(year,-2,getdate())

but can't make work converting column upfront. feel stupid right :-(

can me out please?


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