MS Access SQL：添加两个 COUNT 语句 returns 总和的多个副本而不是一个

Question

所以我正在尝试在两个不同的计数之间执行基本的算术函数（+、-、*、/）。在测试运行中，我一直在使用以下语句查询 return 我的两个计数的总和（“724”）：

SELECT (SELECT COUNT(qryAttainment.[Attainment Samples Received]) 
          FROM qryAttainment 
          WHERE qryAttainment.[Attainment Samples Received]="On Time") +
       (SELECT COUNT(qryAttainment.[Attainment CofA Issued]) 
          FROM qryAttainment 
         WHERE qryAttainment.[Attainment CofA Issued]="On Time") AS [Test] 
  FROM qryAttainment

不幸的是，return1240 行都用相同的数字（“724”）填充。我怎样才能将它设为 return 包含所需答案的一行？

Answer 1

SELECT 
    SUM(IIF(qryAttainment.[Attainment Samples Received]="On Time", 1, 0)) 
    +
    SUM(IIF(qryAttainment.[Attainment CofA Issued]="On Time", 1,  0))
 FROM qryAttainment

MS Access SQL：添加两个 COUNT 语句 returns 总和的多个副本而不是一个

MS Access SQL: Adding two COUNT statements returns multiple copies of the sum instead of one

sql

ms-access