ORA-01723: columns of length zero are not allowed

Hello

I try to combine the 2 tables (one of the tables as a single column and the other has 2 columns)... Here's the query that I'm running

create the table temp_combine
as
SELECT the CITY, NULL AS TABLE_A Prov.
Union of all the
SELECT CITY, Prov. OF TABLE_B

Here is the error message I got:

ORA-01723: columns of length zero are not allowed

Please advice, how to solve this problem

How do I solve this problem

Or reverse the order of the union of all the

SELECT CITY, Prov FROM TABLE_B
union all
SELECT CITY, NULL AS Prov FROM TABLE_A

or a cast of NULL for the Prov. data type (for example assuming that it is varchar2 (10)):

SELECT CITY, CAST(NULL AS VARCHAR2(10)) AS Prov FROM TABLE_A
union all
SELECT CITY, Prov FROM TABLE_B

Tags: Database

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