你如何从mysql中选择每第n行

How do you select every n-th row from mysql(你如何从mysql中选择每第n行)

问题描述

我需要提取数据库中的一系列值来创建折线图.因为我不需要高分辨率，所以我想通过从数据库中选择每 5 行来重新采样数据.

I have a series of values in a database that I need to pull to create a line chart. Because i dont require high resolution I would like to resample the data by selecting every 5th row from the database.

推荐答案

SELECT * 
FROM ( 
    SELECT 
        @row := @row +1 AS rownum, [column name] 
    FROM ( 
        SELECT @row :=0) r, [table name] 
    ) ranked 
WHERE rownum % [n] = 1 

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