SELECT DISTINCT
时间: 2024-02-10 15:59:55 浏览: 51
`SELECT DISTINCT` is a clause used in SQL queries to retrieve only unique values from a table or a result set. It filters out duplicate records and returns only one instance of each unique record. For example, if you have a table of sales data and you want to retrieve a list of distinct product names, you can use `SELECT DISTINCT product_name FROM sales_data`.
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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
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