使用分隔符提取 MySQL 子串

MySQL substring extraction using delimiter(使用分隔符提取 MySQL 子串)

问题描述

我想从 MySQL 中的字符串中提取子字符串.该字符串包含多个由逗号('，')分隔的子字符串.我需要使用任何 MySQL 函数提取这些子字符串.

I want to extract the substrings from a string in MySQL. The string contains multiple substrings separated by commas(','). I need to extract these substrings using any MySQL functions.

例如:

Table Name: Product
-----------------------------------
item_code  name    colors
-----------------------------------
102        ball     red,yellow,green
104        balloon  yellow,orange,red  

我想选择颜色字段并将子字符串提取为以逗号分隔的红色、黄色和绿色.

I want to select the colors field and extract the substrings as red, yellow and green as separated by comma.

推荐答案

可能与此重复:将值从一个字段拆分为两个

不幸的是，MySQL 没有拆分字符串功能.如上面的链接所示，有用户定义的拆分函数.

Unfortunately, MySQL does not feature a split string function. As in the link above indicates there are User-defined Split function.

获取数据的更详细的版本如下:

A more verbose version to fetch the data can be the following:

SELECT SUBSTRING_INDEX(SUBSTRING_INDEX(colors, ',', 1), ',', -1) as colorfirst,
       SUBSTRING_INDEX(SUBSTRING_INDEX(colors, ',', 2), ',', -1) as colorsecond
....
       SUBSTRING_INDEX(SUBSTRING_INDEX(colors, ',', n), ',', -1) as colornth
  FROM product;

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