I defined 3 compare column method. They are :
1, TABLE. For example : Table EMP on all the database should have the same structure.
2, HOST. For example : Table EMP and table EMPLOYEE should have the same structure on production database.
3, ALL. For example: Table EMP on test database should have the same columns with table EMPLOYEE on production database.
With this three compare methods, we can easily compare any tables on any databases. The compare are not limited on two tables compare, for example, you can compare ten tables in one time if they suppose to have the same structure.
We will create the configuration file and run it for each method in later chapters.