mysql order by query在联合内部不起作用

这是我的查询。查询将显示id为2的用户，并将用户id为2以外的其他用户合并

(SELECT account.accountid,account.accountname FROM account,entity WHERE entity.id =  account.accountid  AND entity.deleted=0 AND account.accountid = 2) 
UNION 
(SELECT account.accountid,account.accountname FROM account,entity WHERE entity.crmid =  account.accountid  AND entity.deleted=0 AND account.accountid NOT IN(2) ORDER BY account.accountname )

查询很好地显示了结果，但order by不起作用。 我在这里要做什么

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请帮助我。

使用一个查询，首先按

account.accountid=2

排序，然后按

account.accountname

SELECT account.accountid,account.accountname 
FROM account,entity 
WHERE entity.id =  account.accountid  
AND entity.deleted=0 
order by case when account.accountid = 2 then 1 else 2 end,
         account.accountname 

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使用一个查询，首先按

account.accountid=2

排序，然后按

account.accountname

SELECT account.accountid,account.accountname 
FROM account,entity 
WHERE entity.id =  account.accountid  
AND entity.deleted=0 
order by case when account.accountid = 2 then 1 else 2 end,
         account.accountname