Sql Sybase对不同行集的行数

Question

我有一个表，其中包含每笔交易的security_id和side（买入或卖出）。我想计算不同的security_id和side组合的数量。

因此，当我执行以下操作时，我会获得所有符号方面的列表，但我不知道如何获得总计数？

select 
  security_id, side
from 
  trade
group by security_id, side

我想要的结果是1行，告诉我表中有多少不同的security_id，我有。

还有一种方法可以确定哪些security_id有双方的条目（买入和卖出）。

Answer 1

Select Count(*)
From    (
        Select security_id, side
        From trade
        Group security_id, side
        ) As Z

第二个问题：

Select security_id
From trade
Where side In('BUY','SELL')
Group security_id
Having Count( Distinct side ) = 2

Answer 2

你试过这个吗？

select 
 security_id, side , count(*)
     from 
        trade
       group by security_id, side