select distinct

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select DISTINCT

SELECT DISTINCT语句用于返回唯一不同的值。在表中，一个列可能会包含多个重复值，有时您也许希望仅仅列出不同（distinct）的值。使用DISTINCT关键字可以实现这一目的。例如，可以使用SELECT DISTINCT来查询表中不同的值，并返回结果集中的唯一值。根据需要，可以对一个或多个列使用DISTINCT关键字来获取不同的值。通过使用SELECT DISTINCT语句，可以过滤掉结果集中重复的数据，让查询结果更加清晰和准确。

Select distinct

" DISTINCT" is a SQL statement used to retrieve unique or distinct values from a database table. It eliminates any duplicate rows that might exist in the result set.

For example, if you have a table named "customers" with columns "id", "name", and "email", you can use the following SQL query to retrieve a list of distinct email addresses:

SELECT DISTINCT email FROM customers;

This would return a list of unique email addresses from the "customers" table.