INSERT INTO table2(frmdt,todt)
SELECT ca.frmdt,ca.todt
FROM table1 t
CROSS APPLY(SELECT FDT1, TODT1
UNION ALL
SELECT FDT2, TODT2
UNION ALL
SELECT FDT3, TODT3) ca(frmdt,todt)
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Deja View - The strange feeling that somewhere, sometime you've optimised this query before
How to get the best help on a forum
http://www.sqlservercentral.com/articles/Best+Practices/61537