>How to exchange records between two tables which have exactly the same structure with exactly the same number of records in a snap?

Something like

USE table1 IN 0 EXCLUSIVE 
USE table2 IN 0 EXCLUSIVE 
SELECT * FROM table1 INTO CURSOR crsTemp
SELECT table1
ZAP
INSERT INTO table1 SELECT * FROM table2
SELECT table2
ZAP
INSERT INTO table1 SELECT * FROM crsTemp
USE IN table1
USE IN table2
USE IN crsTemp