TSQL动态枢轴

Question

我在使用PIVOT SQL脚本时遇到了一个“小”问题。我目前的解决方案基于类似的问题 动态枢轴 .

我已经写好了PIVOT脚本，基本上没问题。然而，我的情况是这样的，脚本输出类似这样的内容，而不是将唯一的条目放在单行上

ListingEntryId   Address        Employees   Location
1                NULL           NULL        Nottingham
1                Canal Street   NULL        NULL
1                NULL           3           NULL
2                NULL           NULL        London
2                Camden         NULL        NULL
2                NULL           12          NULL

而我所寻找的结果应该是这样的

ListingEntryId   Address        Employees   Location
1                Canal Street   3           Nottingham
2                Camden         12          London

这是脚本

DECLARE @listingId INT = 1;
DECLARE @cols AS NVARCHAR(MAX), @query AS NVARCHAR(MAX)

SELECT LEV.ListingColumnId, LEV.ListingEntryId, LE.CreatedBy, LEV.EntryValue, LD.ColumnTitle, LD.[Index]
INTO #ListingTable
FROM ListingEntryValue LEV LEFT OUTER JOIN 
ListingEntry LE ON LEV.ListingEntryId=LE.Id
LEFT OUTER JOIN 
ListingDefinition LD ON LEV.ListingColumnId = LD.Id
WHERE LE.ListingId = @listingId;

SELECT * FROM #ListingTable;

SELECT @cols = STUFF((SELECT DISTINCT TOP 100 PERCENT ',' + QUOTENAME(LT.ColumnTitle) FROM #ListingTable LT
FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1,1,'')
SELECT @cols;

SET @query = 'SELECT ListingEntryId,' + @cols + ' FROM (SELECT ListingEntryId, ListingColumnId, EntryValue, ColumnTitle, [Index] FROM #ListingTable LT) x
PIVOT (MAX(EntryValue) FOR ColumnTitle IN (' + @cols + ')
) p'

PRINT @query
EXECUTE(@query);


DROP TABLE #ListingTable

我将不胜感激一些可以帮助我解决这个问题的指示。我在这里做了一个小提琴，由于某种奇怪的原因，它没有输出任何东西，但生成架构的所有代码都在那里

Answer 1

将透视中的字段限制为仅需要的元素(X，Y，Value)

SET @query = 'SELECT ListingEntryId,' + @cols + ' FROM (SELECT ListingEntryId, EntryValue, ColumnTitle FROM #ListingTable LT) x
PIVOT (MAX(EntryValue) FOR ColumnTitle IN (' + @cols + ')
) p'

返回

ListingEntryId  Address         Employees   Location
1               Canal Street    3           Nottingham
2               Camden          12          London