Mysql substring extraction using delimiter

问题

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.

For example :

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

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

回答1:

A possible duplicate of this: Split value from one field to two

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

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;

回答2:

Check the use of SPLIT_STR function here at line 64 to 69

来源：https://stackoverflow.com/questions/34992575/mysql-substring-extraction-using-delimiter