mysql使用子查询计算百分比

Question

有人可以帮忙确定我的结果集的百分比吗，我无法在子查询中执行此操作：

SELECT
CntryCD, 
Country,
SectyCD,
SecurityType,
COUNT(SecID) as SecurityCount,

concat(count(SecID)/(select count(SecID) from wca.scmst)*100, '%') as Percentage

FROM
(
            select distinct
            wca.region.CntryCD,
            wca.region.Country,
            wca.scmst.SectyCD,
            secty.SecurityDescriptor as 'SecurityType',
            wca.bond.SecID 
            from wca.bond
            inner join wca.scmst on wca.bond.secid = wca.scmst.secid
            inner join wca.secty on wca.scmst.sectycd = wca.secty.SectyCD
            left outer join wca.scexh on wca.scmst.secid = wca.scexh.secid
            left outer join wca.exchg on wca.scexh.exchgcd = wca.exchg.exchgcd
            left outer join wca.region on ifnull(wca.exchg.cntrycd,'UB') = wca.region.cntrycd
            where
            wca.bond.actflag <> 'D'
            and wca.scmst.actflag <> 'D'
            and wca.scmst.statusflag <> 'I'

            union

            select distinct
            wca.region.CntryCD,
            wca.region.Country,
            wca.scmst.SectyCD,
            secty.SecurityDescriptor as 'SecurityType',
            wca.scmst.SecID
            from wca.scmst
            inner join wca.sectygrp on wca.scmst.sectycd = wca.sectygrp.sectycd and 3> sectygrp.secgrpid
            inner join wca.secty on wca.scmst.sectycd = wca.secty.SectyCD
            left outer join wca.scexh on wca.scmst.secid = wca.scexh.secid
            left outer join wca.exchg on wca.scexh.exchgcd = wca.exchg.exchgcd
            left outer join wca.region on ifnull(wca.exchg.cntrycd,'UB') = wca.region.cntrycd
            where
            wca.scmst.actflag <> 'D'
            and wca.scexh.liststatus <> 'D'
            and (wca.scexh.actflag <> 'D' or wca.scexh.actflag is null)
            and wca.scmst.statusflag <> 'I'
) AS T1
where
country = 'United Kingdom'
group by Country, SectyCD;

我得到以下结果集：

百分比是错误的-我正在尝试从所有行的总数中算出每行的百分比，应该是24218。例如，第一个记录计数13663/24218 * 100 = 56.4167％。预先感谢