Question

我有以下查询，它试图找出某个产品与产品总数相比的百分比。 IE：[产品数量] / [总产品数量] =百分比

;WITH totalCount AS(
    SELECT 
        CAST(COUNT(id) as Integer)as totalCount
    FROM TABLE_NAME
)
SELECT 
    ((CAST(COUNT(DISTINCT id) as Integer)/(SELECT * FROM totalCount))*100) as 'Percent'
FROM TABLE_NAME

但是，除非只有一条记录，否则百分比列始终返回“0”。另外，有没有办法将totalCount和Select查询添加到一个？

基本上，你如何划分两个Count（）字段？

Answer 1

将你的总计数作为除整数之外的数字（DECIMAL？） - 数学四舍五入。

Answer 2

投射为具有小数精度的东西，而不是整数。浮动或真实。

select cast(distinctCount as real)/cast(totalCount as real) * 100.00
   , distinctCount
   , totalCount
from (
 select count(distinct id) as distinctCount
  , count(id) as totalCount
  from Table) as aggregatedTable

Answer 3

不应该是：

;WITH totalCount AS(
    SELECT 
        CAST(COUNT(id) as Integer)as totalCount
    FROM TABLE_NAME
)
SELECT 
    ((CAST(COUNT(DISTINCT id) as Integer)*100/(SELECT count(*) FROM totalCount))) as 'Percent'
FROM TABLE_NAME

注意SELECT COUNT（*）。此外，你应该在分割之前相乘，否则你将总是得到零

SQL除以两个计数（）

3 个答案: