SQL 动态查询无效列错误

Question

我有以下查询：

DECLARE @DynamicPivotQuery AS NVARCHAR(MAX)
DECLARE @ColumnName AS NVARCHAR(MAX)

SELECT @ColumnName = ISNULL(@ColumnName + ',','') + QUOTENAME(MaxDate)
FROM (SELECT DISTINCT MaxDate FROM CustPeriodTable) AS MaxDates

SET @DynamicPivotQuery =

N'SELECT ' + @ColumnName + ' AS Test, min(rn)
FROM CustPeriodTable '

EXEC sp_executesql @DynamicPivotQuery

@ColumnName 中的每个条目都收到无效的列名错误。我正在设置一个更复杂的查询，该查询将涉及一个数据透视表，但我正试图让这个块首先工作。谁能指出这个问题可能来自哪里？

Answer 1

对于这些类型的问题，您需要查看什么是动态查询。而不是执行它 select 它。

DECLARE @DynamicPivotQuery AS NVARCHAR(MAX)
DECLARE @ColumnName AS NVARCHAR(MAX)
DECLARE @DynamicPivotQuery AS NVARCHAR(MAX)
DECLARE @ColumnName AS NVARCHAR(MAX)

SELECT @ColumnName = ISNULL(@ColumnName + ',','') + QUOTENAME(MaxDate)
FROM (SELECT DISTINCT MaxDate FROM CustPeriodTable) AS MaxDates

SET @DynamicPivotQuery =

N'SELECT ' + @ColumnName + ' AS Test, min(rn)
FROM CustPeriodTable '

SELECT @DynamicPivotQuery

-- EXEC sp_executesql @DynamicPivotQuery

从这里您应该能够确定问题所在。

SQL 动态查询无效列错误

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