Check out example codes for "sql common columns". It will help you in understanding the concepts better.
Code Example 1
-- NB: Applicable for Oracle and PL/SQL only select * from all_tab_cols A where A.COLUMN_NAME in ( select B.column_name from all_tab_cols B where B.table_name = 'xxx' ) and A.table_name != 'xxx' and A.TABLE_NAME = 'yyy';
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