SQL 服务器：如何合并或分组行？

Question

在T-SQL中，给定输入数据如

+------+------+--------+------+------+------+--------+------+
| Col1 | Col2 |  Col3  | Col4 | Col5 | Col6 |  Col7  | Col8 |
+------+------+--------+------+------+------+--------+------+
| 1    | 30   | 1.0000 | desc | NULL | NULL | NULL   | NULL |
| 31   | 60   | 2.0000 | desc | NULL | NULL | NULL   | NULL |
| 61   | 90   | 1.0000 | desc | NULL | NULL | NULL   | NULL |
| NULL | NULL | NULL   | NULL | 1    | 30   | 1.5000 | desc |
| NULL | NULL | NULL   | NULL | 1    | 30   | 2.5000 | desc |
| NULL | NULL | NULL   | NULL | 1    | 30   | 1.1000 | desc |
+------+------+--------+------+------+------+--------+------+

如何获得此输出：

+------+------+--------+------+------+------+--------+------+
| Col1 | Col2 |  Col3  | Col4 | Col5 | Col6 |  Col7  | Col8 |
+------+------+--------+------+------+------+--------+------+
|    1 |   30 | 1.0000 | desc |    1 |   30 | 1.5000 | desc |
|   31 |   60 | 2.0000 | desc |    1 |   30 | 2.5000 | desc |
|   61 |   90 | 1.0000 | desc |    1 |   30 | 1.1000 | desc |
+------+------+--------+------+------+------+--------+------+

输入的第 4、5 和 6 行“合并”以获得所需的输出。

如果总行数不是偶数，这也应该有效。

Answer 1

这是一个解决方案。如果给定 table 的右半部分行数多于左半部分，则此方法无效。你可以看到我在做什么，你可以修改它来处理这种情况：

DECLARE @temp1 TABLE ( col1 INT, col2 INT, col3 DECIMAL(10,4), col4 NVARCHAR(20), col5 INT, col6 INT, col7 DECIMAL(10,4), col8 NVARCHAR(20) )

INSERT INTO @temp1 (col1,col2,col3,col4) VALUES
(1,30,1,'desc'),
(31,60,1,'desc'),
(61,90,1,'desc'),
(81,120,1,'desc')

INSERT INTO @temp1 (col5,col6,col7,col8) VALUES
(1,30,1.5,'desc'),
(1,30,2.5,'desc'),
(1,30,1.1,'desc')

SELECT col1,col2,col3,col4,col5,col6,col7,col8 FROM
(
    SELECT col1,col2,col3,col4,ROW_NUMBER() OVER(ORDER BY col5) AS RowNumber  FROM @temp1
    WHERE col1 IS NOT NULL
) t1 LEFT JOIN 
(
    SELECT col5,col6,col7,col8,ROW_NUMBER() OVER(ORDER BY col1) AS RowNumber  FROM @temp1
    WHERE col5 IS NOT NULL
) t2 ON t1.RowNumber = t2.RowNumber

结果：

SQL 服务器：如何合并或分组行？

SQL Server : how to merge or group up rows?

sql

tsql

sql-server