Question

我有一个简单的select语句，例如：

SELECT *
FROM [customer] AS [c]
    INNER JOIN [customertype] AS [ct] ON [c].[CustTypeKey] = [ct].[CustTypeKey]
    INNER JOIN [ProjectCustomer] AS [pc] ON [c].[CustomerKey] = [pc].[CustomerKey]
    INNER JOIN [Project] AS [p] ON [pc].[ProjectKey] = [p].[ProjectKey]
    INNER JOIN [Address] AS [A] ON [P].ProjectGuid = [A]. [AddressGuid]
WHERE [ct].[CustTypeKey] = 7
    AND [c].[Name] = 'Customer'
    AND [A].[RegionKey] = 2
    OR [A].[RegionKey] = 3

由于某些原因，WHERE子句无法正常工作。我按[A].[RegionKey] = 2和[A].[RegionKey] = 3进行过滤。因此，我想获取所有具有RegionKey 2和3的项，但它只获取具有RegionKey 3的值，并且我确定我也具有RegionKey 2的项。

此WHERE子句在做什么？

Answer 1

更改此：

AND [A].[RegionKey] = 2
   OR [A].[RegionKey] = 3

对此：

AND ([A].[RegionKey] = 2
   OR [A].[RegionKey] = 3)

或者这个：

AND [A].[RegionKey] IN (2,3)

然后确保WHERE子句中的其他条件正确，因为其中至少有一个可能过度过滤。

Answer 2

SELECT
                    *
                    FROM [customer] AS [c]
                        INNER JOIN [customertype] AS [ct] ON [c].[CustTypeKey] = [ct].[CustTypeKey]
                        INNER JOIN [ProjectCustomer] AS [pc] ON [c].[CustomerKey] = [pc].[CustomerKey]
                        INNER JOIN [Project] AS [p] ON [pc].[ProjectKey] = [p].[ProjectKey]
                        INNER JOIN [Address] AS [A] ON [P].ProjectGuid = [A]. [AddressGuid]
                    WHERE [ct].[CustTypeKey] = 7
                        AND [c].[Name] = 'Customer'
                         AND ([A].[RegionKey] = 2 OR [A].[RegionKey] = 3)

您需要在受OR子句影响的两个项目周围添加（）。现在，OR子句使之前的AND语句无效。

您先前的查询是用简单的英语说的： “返回所有具有保管类型键7，客户名称和区域键2的结果，或仅返回具有区域键3的结果（因此，如果区域键为3，则不必成为客户或客户类型为7）。

您的代码现在应该可以正确运行。

where子句仅使用OR

2 个答案: