计算单个列的多个数据查询

Question

我有一个列名状态（int），其中只插入0和1，具体取决于逻辑，我想要一个计数查询，它可以计算单个查询中表中有多少0和多少1像：

从productDetail中选择Count（state）......

Answer 1

select
    sum(state) countOfOnes,
    sum(decode(state, 0, 1, 0)) countOfZeros 
from
    productDetail
;

或

select
    sum(state) countOfOnes,
    count(*) - sum(state) countOfZeros 
from
    productDetail
;

或

select
    state, 
    count(*) over (partition by state order by state) countOfState
from
    productDetail
;

前两个示例将返回一行，其中包含两列：

countOfOnes  countOfZeros
=========================
154          21  

第三个示例将返回两行，每列两行，每个州一行。

state        countOfState
=========================
0            21
1            154  

Answer 2

另一种变体：

select 
  count(*) countOverall,
  sum(state) countOfOnes,
  count(*) - sum(state) countOfZeroes
from
  productDetail;

Answer 3

select count(state) from productDetail Where state = 0
select count(state) from productDetail Where state = 1