...INSERT INTO STORY_TAGS (TAGS_)
SELECT DISTINCT SUBSTRING_INDEX(SUBSTRING_INDEX(TAGS_,',',mCtr),',',-1) AS
valsAsRows FROM (SELECT (cb.ctr*cc.ctr)+ca.ctr AS mCtr FROM (SELECT 1 ctr
UNION SELECT 2 UNION SELECT 3 UNION SELECT 4) ca CROSS JOIN (SELECT 0 ctr
UNION SELECT 1 UNION SELECT 2 UNION...