表結構和內容：
insert into test(val1,val2) values('name','wd');
insert into test(val1,val2) values('email','[email protected]');
insert into test(val1,val2) values('age','30');
sql語句：
declare @s varchar(8000)
set @s = 'select ';
select @s = @s + val1 +' = max(case when val1 = ''' + val1 + ''' then val2 end), '
from test
set @s = left(@s, len(@s) - 1)
set @s = @s + ' from test'
exec(@s)
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