Most database engines support a couple of SQL functions that help in cases
like this, read your database docs for either the ISNULL or the COALESCE
function.
Another technique is to use an SQL CASE statement.
For all three methods the idea is to supply a default value to substitute
when the
Thanks for your help,Rick.
Followed your advice, I've solved the problem. Following is the
solution:
select([table_name]).order_by(case([(table_name.c.s_date==None,table_name.c.f_date)],else_=table_name.c.s_date))
Thanks again :)
On 11月9日, 上午1时48分, Rick Morrison [EMAIL PROTECTED] wrote:
