What is the method for deduplicating fields in multiple tables in MySQL?

One way to deduplicate fields from multiple tables in MySQL is by using the following methods:

1. By using the DISTINCT keyword: When using the SELECT statement to query, you can use the DISTINCT keyword in the field list to remove duplicate field values. For example:

SELECT DISTINCT column_name FROM table_name;

This will return unique values of the specified column.

1. Using the UNION keyword: The UNION operator merges the results of multiple SELECT statements and automatically removes duplicate values. For example:

SELECT column_name FROM table1
UNION
SELECT column_name FROM table2;

This will return unique values from specified columns in table1 and table2.

1. To remove duplicates from multiple tables and retrieve other related fields simultaneously, you can use the INNER JOIN keyword for joining and the DISTINCT keyword to eliminate duplicate values. For example:

SELECT DISTINCT t1.column_name FROM table1 t1
INNER JOIN table2 t2 ON t1.related_column = t2.related_column;

This will return unique values from the specified columns in table1 and table2, and only return records where the associated columns match.

Please choose the appropriate method for deduplicating multi-table fields based on specific needs.