Question

我有一个书面查询来获取总数。但它返回语法错误。查询如下：

((SELECT COUNT(*) FROM References 
  WHERE DocumentID = 15354 AND CustomerID = 896  AND ReferenceType = 1) 
  + 
(SELECT COUNT(*) FROM References 
 WHERE DocumentID = 15354 AND ReferenceType = 0)) AS TotalReference

我该怎么做才能解决错误？

Answer 1

您缺少count（）函数调用的参数，并且在ReferenceType = 1之前缺少AND和（或OR）

((SELECT COUNT(*) 
    FROM References 
    WHERE DocumentID = 15354 
    AND CustomerID = 896 
    AND ReferenceType = 1) + 
 (SELECT COUNT(*) 
    FROM References 
    WHERE DocumentID = 15354 
    AND ReferenceType = 0)) AS TotalReference

另外，您是否考虑过仅在一个子查询中撤回计数？

(SELECT COUNT(*) 
    FROM References 
    WHERE DocumentID = 15354 
    AND ((ReferenceType = 1 AND CustomerID = 896)
        OR (ReferenceType = 0))) AS TotalReference

Answer 2

SELECT ((SELECT COUNT(*) FROM [References]
  WHERE DocumentID = 15354 AND CustomerID = 896 AND ReferenceType = 1) +
  (SELECT COUNT(*) FROM [References]
     WHERE DocumentID = 15354 AND ReferenceType = 0))
AS TotalReference

Answer 3

我对SQL Server的经验不多，但我认为它是缺失的，而且我认为计数需要*（在Oracle中这是必需的）。同样在Oracle中我们需要一开始的SELECT（以及来自DUAL但在SQL Server中不需要这样做）：

select 
((SELECT COUNT(*) FROM References 
WHERE DocumentID = 15354 
AND CustomerID = 896 
and ReferenceType = 1) 
+ 
(SELECT COUNT(*) FROM References 
WHERE DocumentID = 15354 
AND ReferenceType = 0)
) AS TotalReference

查找SQL Server 2000中的总计数错误

3 个答案: