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  3. March 2008

Re: AW: Classic Traps -- I need your input!

BirgittaHauser wrote:
There are a dozen ways it could be done, but I chose to use a pretty one-liner: Quarter=%div(Month:4) + 1;

As Simon already demonstrated, there are some problems with your one-liner,
but
why to reinvent the wheel, if there is already a SQL scalar function, that
calculates the quarter from a given date?

Exec SQL Set :MyQuarter = Quarter(:MyDate);

The biggest problem with using SQL scalars is that some are very inefficient. Your set above takes over ten times as long as a simple divide such as "quarter = (month+2)/3". Even if the date is a true date, using %subdt(date:*M) in the expression only adds a few percentage points; it's still ten times faster than the SQL call.

Joe

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