Question

我有2个表，一个（作业）包含作业列表，第二个包含每个作业中记录的详细信息。

Jobs            
JobID   Count       
A       2       
B       3       


Records         
JobID   RecordID    ToBeProcessed   IsProcessed
A           A1          1           1
A           A2          1           1
B           B1          1           1
B           B2          1           0
B           B3          1           0

我如何能够创建一个查询，列出所有具有值为1的ToBeProcessed计数的作业等于值为1的isProcessed计数？提前致谢。非常感谢任何帮助。

Answer 1

首先计算ToBeProcessed设置为1或IsProcessed设置为1的项目数：

SELECT
    JobID
,   SUM(CASE WHEN ToBeProcessed=1 THEN 1 ELSE 0 END) ToBeProcessedIsOne
,   SUM(CASE WHEN IsProcessed=1 THEN 1 ELSE 0 END) IsProcessedIsOne
FROM Records
GROUP BY JobID

这会为您提供所有计数，而不仅仅是ToBeProcessedIsOne等于IsProcessedIsOne的计数。要确保只获得两者相同的记录，请使用HAVING子句或嵌套子查询：

-- HAVING clause
SELECT
    JobID
,   SUM(CASE WHEN ToBeProcessed=1 THEN 1 ELSE 0 END) ToBeProcessedIsOne
,   SUM(CASE WHEN IsProcessed=1 THEN 1 ELSE 0 END) IsProcessedIsOne
FROM Records
GROUP BY JobID
HAVING SUM(CASE WHEN ToBeProcessed=1 THEN 1 ELSE 0 END)=SUM(CASE WHEN IsProcessed=1 THEN 1 ELSE 0 END)

-- Nested subquery with a condition
SELECT * FROM (
    SELECT
        JobID
    ,   SUM(CASE WHEN ToBeProcessed=1 THEN 1 ELSE 0 END) ToBeProcessedIsOne
    ,   SUM(CASE WHEN IsProcessed=1 THEN 1 ELSE 0 END) IsProcessedIsOne
    FROM Records
    GROUP BY JobID
) WHERE ToBeProcessedIsOne = IsProcessedIsOne

注意：如果ToBeProcessed和IsProcessed的类型不允许非零或一的值，则可以将CASE语句替换为列的名称，例如：

SELECT
    JobID
,   SUM(ToBeProcessed) ToBeProcessedIsOne
,   SUM(IsProcessed) IsProcessedIsOne
FROM Records
GROUP BY JobID
HAVING SUM(ToBeProcessed)=SUM(IsProcessedD)

Answer 2

如果我没有误解你的问题，你的语句中只需要一个WHERE子句来查看它们何时都等于1。

 SELECT
      r.JobID AS j_id,
      r.RecordID as r_id,
      r.ToBeProcessed AS tbp,
      r.IsProcessed AS ip
 FROM Records AS r
 WHERE r.ToBeProcessed = 1 AND r.IsProcessed = 1
 GROUP BY j_id;

如果这不是您要求的，请告诉我。

如果它是来自不同表的计数，那么只计算按jobID分组的tbp和ip行，然后在哪里仍然可以做到这一点

SQL：比较具有特定值的2个字段的计数

2 个答案: