select day(  last_day( concat(( 	SELECT CONCAT('2020','01') AS date  ),'01')   ))  AS cm_day_cnt UNION all
select day(  last_day( concat(( 	SELECT CONCAT('2020','02') AS date  ),'02')   ))  AS cm_day_cnt UNION all
select day(  last_day( concat(( 	SELECT CONCAT('2020','03') AS date  ),'03')   ))  AS cm_day_cnt UNION all
select day(  last_day( concat(( 	SELECT CONCAT('2020','04') AS date  ),'04')   ))  AS cm_day_cnt UNION all
select day(  last_day( concat(( 	SELECT CONCAT('2020','05') AS date  ),'05')   ))  AS cm_day_cnt UNION all
select day(  last_day( concat(( 	SELECT CONCAT('2020','06') AS date  ),'06')   ))  AS cm_day_cnt UNION all
select day(  last_day( concat(( 	SELECT CONCAT('2020','07') AS date  ),'07')   ))  AS cm_day_cnt UNION all
select day(  last_day( concat(( 	SELECT CONCAT('2020','08') AS date  ),'08')   ))  AS cm_day_cnt UNION all
select day(  last_day( concat(( 	SELECT CONCAT('2020','09') AS date  ),'09')   ))  AS cm_day_cnt UNION all
select day(  last_day( concat(( 	SELECT CONCAT('2020','10') AS date  ),'10')   ))  AS cm_day_cnt UNION all
select day(  last_day( concat(( 	SELECT CONCAT('2020','11') AS date  ),'11')   ))  AS cm_day_cnt UNION all
select day(  last_day( concat(( 	SELECT CONCAT('2020','12') AS date  ),'12')   ))  AS cm_day_cnt