RE: what to put in place of null

From: Kevin Lange <kgel_at_ppoone.com>
Date: Tue, 05 Jun 2001 14:40:03 -0700
Message-ID: <F001.0031D0CB.20010605144823@fatcity.com>

I don't usually put a null like that in a union. I usually use a '' for a character and a 0 for a number and turn all dates to character. This way there is no matching problem. The thing is, you might have to use a value that you can then work with.

For example, if you data is all positive numbers, you might want to use a -1 to match up to numbers. This way you can test the selected data and act on it accordingly. Plus, if your data is character and can not contain an '*' you might want to use it opposite of character fields. Its all data dependent.

-----Original Message-----
Sent: Tuesday, June 05, 2001 4:31 PM
To: Multiple recipients of list ORACLE-L

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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Author: Kevin Lange
INET: kgel_at_ppoone.com

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