Question

I need to run a query on generated generated column names.

Here’s the query:

select 'col_'||4 from  MY_TABLE 

Note:

1. “4” is a variable that is passed to this query from within the Java code
2. MY_TABLE is a table that contain columns with names (col_4, col_5, etc..)

Answer 1

Inside Oracle you need use dynamic SQL. (YourVariable value is 4 for your example)

EXECUTE IMMEDIATE ' select col_' || YourVariable  || ' from  MY_TABLE ';

From Java you can build any SQL and execute them