Oracle/SQL将多个列按公共列分组

我又回到了另一个Oracle查询。我想做的是计算由公共字段分组的多个列。到目前为止，我已经完成了一半。因此，给出下表

THING ACTION
--------------
T1  _A_
T1  _A_
T1  _B_
T2  _A_
T2  _B_

我有这个疑问

select    THING,
    count(ACTION) as "A"
 from  <table>
 where  ACTION = '_A_'
 group by THING

但我想看到的是

THING A B
--------------
T1    2   1
T2    1   1

但我不知道该怎么做。有什么想法吗

谢谢

select thing,
       count(case action when '_A_' then 1 end) as a,
       count(case action when '_B_' then 1 end) as b
from <table>
group by thing

或当“\u A\u”时的sumcase操作，如果愿意，则1或0结束

或当“\u A\u”时的sumcase操作，如果愿意，则1或0结束

select thing,
       count(case action when '_A_' then 1 end) as a,
       count(case action when '_B_' then 1 end) as b
from <table>
group by thing