How can we minimize the differences between tables?

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Here are some ways to minimize the differences between tables:

1. Standardize data types: Ensure that the columns in both tables have the same data types. For example, if one table has a date column in the format 'dd/mm/yyyy', ensure that the other table also has the same format.

2. Standardize column names: Ensure that the columns in both tables have the same names. For example, if one table has a column named 'State' and another table has a column named 'Province', rename one of the columns to match the other.

3. Remove duplicates: Remove any duplicate records from both tables to eliminate redundancies and ensure consistency.

4. Use unique identifiers: Use unique identifiers like primary keys to link the tables together.

5. Normalize data: Normalize data to ensure that data is stored in its smallest logical parts. For example, if one table has a column with multiple values (like 'First Name' and 'Last Name' in the same column), split it into separate columns.

6. Use data validation: Use data validation to ensure that any new data entered matches the format and values of existing data, to minimize data entry errors.

7. Document data sources: Document the source of the data, so that any future changes to the data can be traced back to their original source.