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16 gru 2015 · SELECT column, COUNT(column) FROM table GROUP BY column HAVING COUNT(column) > 1. This query took 00.59 seconds on a data set of 1 Million rows. This query will give you the (column) value for every duplicate, and also the COUNT (column) result for how many duplicates.
The SQL SELECT DISTINCT Statement. The SELECT DISTINCT statement is used to return only distinct (different) values. Example. Select all the different countries from the "Customers" table: SELECT DISTINCT Country FROM Customers; Try it Yourself »
In this tutorial, you will learn how to use the MySQL DISTINCT clause in the SELECT statement to eliminate duplicate rows in a result set.
25 sty 2024 · Learn how to use the DISTINCT clause in MySQL to retrieve unique rows from a table or multiple tables. See examples, syntax, performance tips and NULL handling with DISTINCT.
25 cze 2024 · Learn how to use the DISTINCT clause in MySQL to retrieve only unique rows from your query results. See syntax, examples, and considerations for using DISTINCT with multiple columns, WHERE clause, and NULL values.
The SELECT DISTINCT statement in MySQL is used to retrieve unique values from a specified column or combination of columns in a table. It is particularly useful when you want to eliminate duplicate rows from the result set.
SELECT is used to retrieve rows selected from one or more tables, and can include UNION operations and subqueries. Beginning with MySQL 8.0.31, INTERSECT and EXCEPT operations are also supported. The UNION, INTERSECT, and EXCEPT operators are described in more detail later in this section.
