RODBC loses time values of datetime when result set is large

Question

So this is VERY strange. RODBC seems to drop the time portion of DateTime SQL columns if the result set is large enough. (The queries are running against an SQL S

Answer 1

Why this happens on large datasets returned from sqlQuery()? I don't know. But was able to workaround it by applying a sql conversion in the sql call:

data <- sqlQuery(channel, "SELECT CONVERT(nvarchar(24), DtTimeField, 21) AS HourDt, * FROM ...

This is your workaround.