Mysql行转列把逗号分隔的字段拆分成多行两种方法

SELECT SUBSTRING_INDEX(SUBSTRING_INDEX('7654,7698,7782,7788',',',help_topic_id+1),',',-1) AS num 
FROM mysql.help_topic 
WHERE help_topic_id < LENGTH('7654,7698,7782,7788')-LENGTH(REPLACE('7654,7698,7782,7788',',',''))+1

SELECT
		a.store_signer_name,
		substring_index( substring_index( a.concatStoreId, ',', b.help_topic_id + 1 ), ',', - 1 ) AS concatStoreId 
	FROM
		(select store_signer_nameconcatStoreId from test) a
		INNER JOIN mysql.help_topic b ON b.help_topic_id < (
			length( a.concatStoreId ) - length(
			REPLACE ( a.concatStoreId, ',', '' )) + 1)

SELECT
  SUBSTRING_INDEX(SUBSTRING_INDEX(table_name.csv_values, ',', numbers.n), ',', -1) AS split_value
FROM
  table_name
  INNER JOIN
  (SELECT 1 n UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9 UNION ALL SELECT 10 UNION ALL
   SELECT 11 UNION ALL SELECT 12 UNION ALL SELECT 13 UNION ALL SELECT 14 UNION ALL SELECT 15 UNION ALL SELECT 16 UNION ALL SELECT 17 UNION ALL SELECT 18 UNION ALL SELECT 19 UNION ALL
   SELECT 20 UNION ALL SELECT 21 UNION ALL SELECT 22 UNION ALL SELECT 23 UNION ALL SELECT 24 UNION ALL SELECT 25 UNION ALL SELECT 26 UNION ALL SELECT 27 UNION ALL SELECT 28 UNION ALL
   SELECT 29 UNION ALL SELECT 30 UNION ALL SELECT 31 UNION ALL SELECT 32 UNION ALL SELECT 33 UNION ALL SELECT 34 UNION ALL SELECT 35 UNION ALL SELECT 36 UNION ALL SELECT 37 UNION ALL
   SELECT 38 UNION ALL SELECT 39 UNION ALL SELECT 40) numbers
  ON CHAR_LENGTH(table_name.csv_values) - CHAR_LENGTH(REPLACE(table_name.csv_values, ',', '')) >= numbers.n - 1;

SELECT
table_name.store_signer_name,
table_name.store_signer_contact,
  SUBSTRING_INDEX(SUBSTRING_INDEX(table_name.concatStoreId, ',', numbers.n), ',', -1) AS store_id
FROM
  (select store_signer_name,store_signer_contact,GROUP_CONCAT(store_id) concatStoreId from t_store_esgin_info where business_status = 1003 and type =0 and start_year = 2023  group by store_signer_name,store_signer_contact having count(1) > 1) table_name
  INNER JOIN
  (SELECT 1 n UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9 UNION ALL SELECT 10 UNION ALL
   SELECT 11 UNION ALL SELECT 12 UNION ALL SELECT 13 UNION ALL SELECT 14 UNION ALL SELECT 15 UNION ALL SELECT 16 UNION ALL SELECT 17 UNION ALL SELECT 18 UNION ALL SELECT 19 UNION ALL
   SELECT 20 UNION ALL SELECT 21 UNION ALL SELECT 22 UNION ALL SELECT 23 UNION ALL SELECT 24 UNION ALL SELECT 25 UNION ALL SELECT 26 UNION ALL SELECT 27 UNION ALL SELECT 28 UNION ALL
   SELECT 29 UNION ALL SELECT 30 UNION ALL SELECT 31 UNION ALL SELECT 32 UNION ALL SELECT 33 UNION ALL SELECT 34 UNION ALL SELECT 35 UNION ALL SELECT 36 UNION ALL SELECT 37 UNION ALL
   SELECT 38 UNION ALL SELECT 39 UNION ALL SELECT 40) numbers
  ON CHAR_LENGTH(table_name.concatStoreId) - CHAR_LENGTH(REPLACE(table_name.concatStoreId, ',', '')) >= numbers.n - 1;