what to put in place of null

From: Harvinder Singh <Harvinder.Singh_at_MetraTech.com>
Date: Tue, 05 Jun 2001 13:48:43 -0700
Message-ID: <F001.0031CE41.20010605133041@fatcity.com>

Hi,

I have a cursor declared as
cursor c1 is
select dd,dd1,dd2,dd3 from dd
union
select null,null,dd2,dd3 from dd1;

i am getting error:
*
ERROR at line 1:

ORA-01790: expression must have same datatype as corresponding expression
ORA-06512: at "DY.REST", line 4
ORA-06512: at "DY.REST", line 10
ORA-06512: at line 1

what to replace null with......
dd1 has only 2 columns dd2 and dd3.....

Thanks
Harvinder
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Author: Harvinder Singh
  INET: Harvinder.Singh_at_MetraTech.com

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