You can check if the colum exists and then run the appropriate `SELECT
DECLARE
v_column_exists number := 0;
BEGIN
Select count(*) into v_column_exists
from user_tab_cols
where upper(column_name) = 'b'
and upper(table_name) = 't1';
if (v_column_exists = 1) then
execute immediate 'select a, b as c, null as d from t1';
ELSE
execute immediate 'select a, c, d from t2';
end if;
end;
/
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