Question

We are refactoring a weird system where within its backend, values that should be stored as number and date columns, with propperly designed constraints, were stored all as varchar (using only UI validation). The thing is, while we do this the new system our ones must start to run so:

Is it possible to manipulate this varchar columns as integer for say lower or greater comparisons and, given that the dates are stored with the same format dd/MM/yyyy is it possible to treat that also varchar column as a date and use functions as: IN BETWEEN?

Answer 1

Would something like this work:

SELECT Column1, Column2
FROM Table
WHERE CONVERT(datetime, DateColumn, 3) BETWEEN @StartDate AND @EndDate