SQL Count和Pivot

Question

我有一个表，它有一个只有2种输入的列：New和Old。它看起来像这样：

old_or_new
----------
  old
  old
  new
  new
  old

我想计算旧的和新的数字并将表格调整为：

column_name | total
--------------------
   old      |   3
   new      |   2

我怎样才能做到这一点？

谢谢！

编辑：

我做的是：

select
    count(case when old_or_new = 'Old' then 1 else 0 end) as old,
    count(case when old_or_new = 'New' then 1 else 0 end) as new
from members

结果如下：

old | new
----------
 3  |  2

Answer 1

这是查询组的最基本形式：

select old_or_new as column_name,
       count(*) as total
from the_table
group by old_or_new;

SQLFiddle：http://sqlfiddle.com/#!15/9469c/1