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 View 中创建交叉表。字段列包含字段标题,每个字段都应该有其关联的值,但有 1 个记录 ID。因此,在示例中,RecordID 1072 应汇总为一行。
最佳答案
您的问题的一部分是您的表结构。不幸的是,MySQL 没有 PIVOT/UNPIVOT
函数,因此您需要使用 UNION ALL
和 CASE
语句来执行此操作:
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
此查询获取三个recvalue列中的所有值并将其放入一列中,以便您可以将这些值转换为单行数据。
关于 View 中的 MySQL 交叉表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11850333/