If it's actually a single row table (doesn't match your join condition: on tab1.cola=tab2.colb and tab1.date1 between tab2.date1 and tab2date2) you can replace it with a view as described here:
http://developer.teradata.com/blog/dnoeth/2011/03/global-and-session-level-parameters-in-sql
If it's actually a single row table (doesn't match your join condition: on tab1.cola=tab2.colb and tab1.date1 between tab2.date1 and tab2date2) you can replace it with a view as described here:
http://developer.teradata.com/blog/dnoeth/2011/03/global-and-session-level-parameters-in-sql
Dieter