Break comma separated into multiple rows in MYSQL

 Break comma-separated string/column/parameter into multiple rows in MYSQL.

with recursive

    cs_string as ( select 'a,b,c,d' as items),


    cs_rowID as ( select 1 as n union select n + 1 from cs_rowID, cs_string

        where n <= length(items) - length(replace(items, ',', '')))


select distinct substring_index(substring_index(items, ',', n), ',', -1) 

group_name from cs_rowID, cs_string


Output:




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