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我有以下数据。

RecordID    |RecValue1  |RecValue2  |RecValue3              |Fields
1072        |130227     |0          |                       |Document_Number
1072        |1241388    |0          |                       |Supplier_Number
1072        |20008968   |0          |                       |Invoice_Number
1072        |           |0          |1995-04-21 00:00:00    |Invoice_Date
1072        |           |0          |1995-04-23 00:00:00    |Posting_Date
1072        |Invoice    |0          |                       |Document_Type
1072        |           |0          |1995-05-12 17:46:32    |Paid_Date
1072        |F609       |0          |                       |Entry_ID

有没有办法在视图中创建交叉表。Fields 列包含字段标题，并且每个相应的字段都应该有其关联的值，但具有 1 个记录 ID。因此，在示例中，RecordID 1072 应汇总为一行。

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1 回答 1

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您的部分问题是您的表结构。不幸的是 MySQL 没有PIVOT/UNPIVOT函数，所以你需要用一个UNION ALLthenCASE语句来做到这一点：

SELECT RecordId,
  MAX(CASE WHEN Fields = 'Document_Number' THEN recvalue END)  Document_Number,
  MAX(CASE WHEN Fields = 'Supplier_number' THEN recvalue END)  Supplier_number,
  MAX(CASE WHEN Fields = 'Invoice_number'  THEN recvalue END)  Invoice_number,
  MAX(CASE WHEN Fields = 'Invoice_Date' THEN recvalue END)  Invoice_Date,
  MAX(CASE WHEN Fields = 'Posting_Date' THEN recvalue END)  Posting_Date,
  MAX(CASE WHEN Fields = 'Document_type' THEN recvalue END)  Document_type,
  MAX(CASE WHEN Fields = 'Paid_Date' THEN recvalue END)  Paid_Date,
  MAX(CASE WHEN Fields = 'Entry_ID' THEN recvalue END)  Entry_ID
FROM
(
  SELECT RecordId, RecValue1 RecValue, fields
  FROM test
  UNION ALL
  SELECT RecordId, RecValue2 RecValue,fields
  FROM test
  UNION ALL
  SELECT RecordId, RecValue3 RecValue, fields
  FROM test
) unpvt
GROUP BY RecordId

请参阅带有演示的 SQL Fiddle

此查询从三个 recvalue 列中获取所有值并将其放入一列，以便您可以将这些值转换为单行数据。

于 2012-08-07T16:56:06.240 回答