Substituting "19xx" with "18xx"


I have a four-digit column (columna) that begins with either "18" or "19".  If the column begins with "19", I would like to substitute with "18" for lookup purposes.

Can you tell me how to do this in SAS?
moriniaAdvanced Analytics AnalystAsked:
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If substr(col1,1,2) = "19" then substr(col1,1,2) = "18";

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Aneesh RetnakaranDatabase AdministratorCommented:
Why don't you update the column to deduct 1000 for all the records above 1900

update table
set columna = columna - 1000
where columnA >=1900
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