maparray(range(DATEDIF("2018-07-01","2019-06-30","M")+1),format(monthdelta("2018-07-01",item-1),"yyyy-MM"))

select 

DATE_FORMAT(m1, '%Y-%m')

from

(select (CONCAT('2018-07','-01')  - INTERVAL DAYOFMONTH(CONCAT('2013-01','-01'))-1 DAY) + INTERVAL m MONTH as m1

    from

    (

    select @rownum:=@rownum+1 as m from

    (select 1 union select 2 union select 3 union select 4) t1,

    (select 1 union select 2 union select 3 union select 4) t2,

    (select 1 union select 2 union select 3 union select 4) t3,

    (select 1 union select 2 union select 3 union select 4) t4,

    (select @rownum:=-1) t0

    ) d1

) d2 

where m1<=CONCAT('2019-06','-01')

order by m1

maparray(range(todate("2021-07-01"), todate("2021-07-31"), 1), format(item, "yyyy-MM-dd"))