如何在单独的列中合并多个选择语句？

印宝印章

我有以下三个陈述：
select count (distinct vid) as SUM_OF_SEC from pdalis where pid in(500,504);
select sum (amount*paidperitem) SUM_OF_A from pdalis where pid = 501 ;
+ s* L* W5 J/ qselect sum(amount * paidperitem) SUM_OF_P from pdalis where pid IN (500,504);
如何将它们全部合并成3个并排的列？
. P) X; g; R5 h9 l$ x* m               
( h6 z0 c5 p  n1 d* b5 S解决方案: