UNION ALL in VARCHAR and CLOB data types

Hi all

I want to execute the below query, but the Oracle is throwing a single error.

Select the comments as cm_comments from table1

Union of all the

Select text_action from table2

Union of all the

Select the notes to table 3

Union of all the

Select null from table 4

Error I got: ORA-01790: expression must have the same type of data, matching expression

Here, all columns have the data type of the CLOB except the 'notes' column in the table "table3." I know that this is the reason for the error, but I need a work around that. One solution I know is that cast varchar of clob type, but in this case, there is a chance to cut the data if the CLOB column contains data whose length is greater than the maximum data length for a VARCHAR column.

Please help me in this case to find a solution to this problem.

Your timely help is well appreciated.

Thanks in advance.

Try the below with TO_CLOB

Select the comments as cm_comments from table1

Union of all the

Select text_action from table2

Union of all the

Select TO_CLOB (notes) in table3

Union of all the

Select null from table 4

Tags: Database

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