在SQL Server 2000中查找总计数错误

Question

我有一个查询来获得总数。但它返回一个语法错误。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 

我该如何解决这个错误？

Answer 1

你缺少对count（）函数调用的参数，你缺少与之前（或OR）引用类型= 1

((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 

而且，你有没有考虑在短短的一个子查询returing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

我与SQL Server没有多少经验，但我认为这是缺少的，也是我认为需要在计数A *（在Oracle这是需要）。同样在Oracle中，我们在开始时需要一个SELECT（并且来自DUAL，但在SQL Server中不需要）：

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