oracle两行合并成一行并拆成多列
时间: 2023-09-04 07:01:18 浏览: 108
在Oracle数据库中,要将两行合并成一行并拆分为多列,可以使用Oracle的行转列技术。以下是一种实现方式:
假设有以下两行数据需要合并和拆分为多列:
行1:A B C
行2:1 2 3
要将这两行合并为一行并拆分为多列,可以使用UNION ALL和Oracle的CASE语句。具体步骤如下:
1. 使用UNION ALL将两行数据连接为一行:
SELECT * FROM
(SELECT 'A' AS Col1, 'B' AS Col2, 'C' AS Col3 FROM dual
UNION ALL
SELECT '1' AS Col1, '2' AS Col2, '3' AS Col3 FROM dual) t;
结果为:
Col1 Col2 Col3
----- ---- ----
A B C
1 2 3
2. 使用CASE语句将合并后的单行数据拆分为多列:
SELECT
(CASE WHEN RowNum = 1 THEN Col1 END) AS Col1,
(CASE WHEN RowNum = 1 THEN Col2 END) AS Col2,
(CASE WHEN RowNum = 1 THEN Col3 END) AS Col3,
(CASE WHEN RowNum = 2 THEN Col1 END) AS Col4,
(CASE WHEN RowNum = 2 THEN Col2 END) AS Col5,
(CASE WHEN RowNum = 2 THEN Col3 END) AS Col6
FROM
(SELECT ROWNUM AS RowNum, Col1, Col2, Col3 FROM
(SELECT 'A' AS Col1, 'B' AS Col2, 'C' AS Col3 FROM dual
UNION ALL
SELECT '1' AS Col1, '2' AS Col2, '3' AS Col3 FROM dual) t);
最终结果为:
Col1 Col2 Col3 Col4 Col5 Col6
---- ---- ---- ---- ---- ----
A B C 1 2 3
通过以上步骤,可以将两行数据合并成一行并拆分为多列。请根据实际情况进行调整,例如列名和表名等。
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