SQL统计胜负题

已知表内容：

要求写sql输出以下内容：

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create table winfail(
time varchar(10),
result char(1)
);
insert into winfail values('2005-05-09','胜');
insert into winfail values('2005-05-09','胜');
insert into winfail values('2005-05-09','负');
insert into winfail values('2005-05-09','负');
insert into winfail values('2005-05-10','胜');
insert into winfail values('2005-05-10','负');
insert into winfail values('2005-05-10','负');

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SELECT time 时间,
    COUNT(CASE result WHEN '胜' THEN 1 END)胜,
    COUNT(CASE result WHEN '负' THEN 1 END)负
FROM winfail GROUP BY time;