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
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