How to convert comma separated string value into rows in MySQL? [duplicate] - mysql

Question

This question already has answers here:
What is the opposite of GROUP_CONCAT in MySQL?
(6 answers)
Split comma separated string into rows in mysql
(3 answers)
Closed 4 months ago.
I have one column in MySQL which is return me comma separated value , I want to convert that column in to rows.
Better answer then How to convert comma separated parameters to rows in mysql?
select value from table limit 1
response
value
honda,activa,pleasure,car
I want this value to row like
value
honda
activa
pleasure
car

Answer 1

CREATE TABLE response (id INT, value TEXT)
SELECT 1 id, 'honda,activa,pleasure,car' value;
SELECT response.id, jsontable.value
FROM response
CROSS JOIN JSON_TABLE(CONCAT('["', REPLACE(value, ',', '","'), '"]'),
'$[*]' COLUMNS (value TEXT PATH '$')) jsontable;
id
value
1
honda
1
activa
1
pleasure
1
car
fiddle
PS. The query assumes that the value does not contain duoble quotes. If they are present then they must be quoted. See https://dbfiddle.uk/HUmPZEo1

Answer 2

First we need to create function which return index value of comma separated value
CREATE FUNCTION `SPLIT_STR`(
x VARCHAR(255),
delim VARCHAR(12),
pos INT
) RETURNS varchar(255) CHARSET utf8mb3
RETURN REPLACE(SUBSTRING(SUBSTRING_INDEX(x, delim, pos),
LENGTH(SUBSTRING_INDEX(x, delim, pos -1)) + 1),
delim, '')
Then Create virtual recursive table from current value
with recursive new_table as (
select value ,LENGTH(t.value) - LENGTH(REPLACE(t.value, ',', '')) as n ,1 as x from table t limit 1
union all
select value, n,1+x as x from new_table where x <= n
)
select TRIM(SPLIT_STR(value,',',x)) as value from new_table
will return
value
honda
activa
pleasure
car