What is the method for de-duplicating a single table qu…

1 year ago
Isabella Edwards
1 minute

There are several methods to remove duplicates in MySQL single table queries.

  1. By using the DISTINCT keyword: it helps in the SELECT statement to eliminate duplicate rows. For example: SELECT DISTINCT column1, column2 FROM table_name;
  2. Group By: The Group By statement can group together identical rows and perform aggregate functions on each group. For example: Select column1, column2 from table_name Group By column1, column2;
  3. Using a subquery: You can use a subquery to filter out non-duplicate data. For example: Select column1, column2 from table_name where (column1, column2) in (select column1, column2 from table_name group by column1, column2);
  4. Using temporary tables: By creating a temporary table to store deduplicated data, you can then query the temporary table. For example, you can create a temporary table named temp_table that selects distinct values from column1 and column2 from the table_name, and then query the temp_table using SELECT * FROM temp_table.

The above are common methods, the choice of which depends on specific needs and data situations.

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