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select-Mysql 统计求和时如何将查不到的结果置为0

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Release： 2016-06-06 09:33:29
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selectmysql

select t.user_id, sum(t.TRADE_MONEY) from lc_account_records t
where t.USER_ID in (42,43,46,50,80)
group by t.USER_ID ;

由于user_id是一个外键，where条件中的user_id可能在这个表中没有记录，查询5条结果只能返回3条结果集，现在想将没有结果的返回0，这该怎么做呢，求各位大神帮忙！

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select mysql
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