Question

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子句正在尝试确定检查的三个复选框（识字，计算或贫困）。可以检查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，输出返回第三部分的两个结果和第四部分的两个结果。

如果我仅使用一个复选框运行查询，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。

我也尝试使用= -1来定义真值，这会返回相同的问题。

非常感谢。

Answer 1

看看这是否更清楚。您不需要IIF函数来检查WHERE子句中的是/否值。通常，括号需要表达逻辑：(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];

此致

访问SQL - 使用复选框的多个OR条件

1 个答案: