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我的查询，哪种作品如下：

SELECT [copyright status],
sum(IIF(layer='key info',1,0)) AS [Key Info],
sum(IIF(layer='approaches',1,0)) AS [Approaches],
sum(IIF(layer='research',1,0)) AS [Research]
FROM resources
WHERE (IIF(literacy,1,0)) OR (IIF(numeracy,1,0)) OR (IIF(poverty,1,0))
GROUP BY [copyright status]

UNION

SELECT null,
sum(IIF(layer='key info',1,0)) AS [Key Info],
sum(IIF(layer='approaches',1,0)) AS [Approaches],
sum(IIF(layer='research',1,0)) AS [Research]
FROM resources
WHERE (IIF(literacy,1,0)) OR (IIF(numeracy,1,0)) OR (IIF(poverty,1,0))

UNION

SELECT [lw status],
sum(IIF(layer='key info',1,0)) AS [Key Info],
sum(IIF(layer='approaches',1,0)) AS [Approaches],
sum(IIF(layer='research',1,0)) AS [Research]
FROM resources
WHERE (IIF(literacy,1,0)) OR (IIF(numeracy,1,0)) OR (IIF(poverty,1,0)) AND [lw status] = 'In Reserve'
GROUP BY [lw status]

UNION

SELECT [lw status],
sum(IIF(layer='key info',1,0)) AS [Key Info],
sum(IIF(layer='approaches',1,0)) AS [Approaches],
sum(IIF(layer='research',1,0)) AS [Research]
FROM resources
WHERE (IIF(literacy,1,0)) OR (IIF(numeracy,1,0)) OR (IIF(poverty,1,0)) AND [lw status] = 'Published'
GROUP BY [lw status];

此查询的所有四个部分中的WHERE子句都试图确定三个提到的复选框（识字、算术或贫困）是否被选中。可以检查这三者的任何组合以获得我想要的结果。

原则上，查询有效。但是，输出为第三部分返回两个结果，为第四部分返回两个结果。

如果我只定义一个复选框来运行查询，那么：

WHERE (IIF(literacy,1,0)) [lw status] = 'In Reserve'

查询工作正常，只是添加一个或多个这些条件似乎会导致问题。

我还尝试使用 =-1 定义真实值，它返回相同的问题。

非常感谢。

4

1 回答 1

2

看看这是否更清楚。您不需要 IIF 函数来检查 WHERE 子句中的 Yes/No 值。此外，需要括号来表达逻辑：(x OR y OR z) AND w

SELECT null as Status,
sum(IIF(layer='key info',1,0)) AS [Key Info],
sum(IIF(layer='approaches',1,0)) AS [Approaches],
sum(IIF(layer='research',1,0)) AS [Research]
FROM resources
WHERE (literacy OR numeracy OR poverty)

UNION

SELECT [copyright status],
sum(IIF(layer='key info',1,0)) AS [Key Info],
sum(IIF(layer='approaches',1,0)) AS [Approaches],
sum(IIF(layer='research',1,0)) AS [Research]
FROM resources
WHERE (literacy OR numeracy OR poverty)
GROUP BY [copyright status]

UNION

SELECT [lw status],
sum(IIF(layer='key info',1,0)) AS [Key Info],
sum(IIF(layer='approaches',1,0)) AS [Approaches],
sum(IIF(layer='research',1,0)) AS [Research]
FROM resources
WHERE (literacy OR numeracy OR poverty) AND [lw status] = 'In Reserve'
GROUP BY [lw status]

UNION

SELECT [lw status],
sum(IIF(layer='key info',1,0)) AS [Key Info],
sum(IIF(layer='approaches',1,0)) AS [Approaches],
sum(IIF(layer='research',1,0)) AS [Research]
FROM resources
WHERE (literacy OR numeracy OR poverty) AND [lw status] = 'Published'
GROUP BY [lw status];

问候

于 2013-06-21T07:26:45.720 回答