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
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