>table1.costctr needs to be converted to a new value. If have put the pseudo code below but would like to do it in an SQL statement.
>
>if table1.costctr = costctr.o_costctr and
> control.site_id = costctr.site_id
>replace table1.costctr with costctr.n_costctr
>endif
>

UPDATE Table1 SET CostCtr = CostCtr.n_CostCtr ;
WHERE Table1.CostCtr = CostCtr.o_costctr ;
AND Control.site_id = CostCtr.site_id

However, it's important to understand that that works with the values of the current records in CostCtr and Control. It's not like XBase code where you can SET RELATION and assume the tables stay in synch as you move.

Tamar