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Error: ORA-01790: expression must have same datatype as corresponding expre

Sh... May 24 2013 — edited May 24 2013

Hey experts,
Getting error
Error: ORA-01790: expression must have same datatype as corresponding expression 01790. 00000 - "expression must have same datatype as corresponding expression"
for follwoing code,

		NULL FLD_CDS_CLOSEOUT,
		FLD_CAD_DESK
	FROM FLD_SE_IN
UNION ALL
NULL FLD_CDS_CLOSEOUT,	
NULL FLD_CAD_DESK
	FROM FLD_GU_IN

please help