how to convert ‘202109’ to 2021-09 in MySQL,
select STR_TO_DATE('202109', '%Y-%m')
select DATE('202109', '%Y-%m')
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I hope you have string. So I think no need to deal with
SELECT INSERT('202109', 5, 0, '-');
Change %Y-%m to %Y%m them just use DATE_FORMAT to get formart what you want
select DATE_FORMAT( STR_TO_DATE('202109', '%Y%m'), '%Y-%m') as ym_formart