mysql 对字符串字段拆分查询
#tag_ids=45,44,43,40,
SELECT
SUBSTRING_INDEX(tag_ids,",",1),
SUBSTRING_INDEX(SUBSTRING_INDEX(tag_ids,",",2),",",-1),
SUBSTRING_INDEX(SUBSTRING_INDEX(tag_ids,",",3),",",-1),
SUBSTRING_INDEX(SUBSTRING_INDEX(tag_ids,",",4),",",-1),
tag_ids
FROM `ac_achievement` ;
SELECT
SUBSTRING_INDEX(tag_ids,",",1),
SUBSTRING_INDEX(SUBSTRING_INDEX(tag_ids,",",2),",",-1),
SUBSTRING_INDEX(SUBSTRING_INDEX(tag_ids,",",3),",",-1),
SUBSTRING_INDEX(SUBSTRING_INDEX(tag_ids,",",4),",",-1),
tag_ids
FROM `ac_achievement` ;
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