Sql server 布局sql server

我有一张像这样的桌子

att1 att2 att3 att4
-------------------
1    6    11    16
2    7    12    17 
3    8    13    18
4    9    14    19 

将表格作为坐标系的查询是什么：

a b val
-------
1 1  1
1 2  6 
1 3  11
1 4  16
2 1  2
2 2  7 
2 3  12
2 4  17
3 1  3
3 2  8
3 3  13
3 4  18
4 1  4
4 2  9
4 3  14
4 4  19

目前我有：

select 1,att1 from data_journal_insurance_raw union all
select 2,att2 from data_journal_insurance_raw union all
select 3,att3 from data_journal_insurance_raw union all
select 4,att4 from data_journal_insurance_raw

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我缺少了“b”部分，怎么做？

你应该在Union中有3列

select att1 ,1,att1 from data_journal_insurance_raw union
select att1 ,2,att2 from data_journal_insurance_raw union
select att1 ,3,att3 from data_journal_insurance_raw union
select att1 ,4,att4 from data_journal_insurance_raw

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如果我理解正确，您希望将表转换为包含行、列和值的表

实际上，您缺少了

a

部分

a

表示行，而

b

表示列。下面的查询应该对您有所帮助

WITH cte AS (SELECT ROW_NUMBER() OVER (ORDER BY att1) AS a, * FROM data_journal_insurance_raw)
SELECT a, 1 as b, CAST(att1 AS VARCHAR(MAX)) FROM cte UNION ALL
SELECT a, 2 as b, CAST(att2 AS VARCHAR(MAX)) FROM cte UNION ALL
SELECT a, 3 as b, CAST(att3 AS VARCHAR(MAX)) FROM cte UNION ALL
SELECT a, 4 as b, CAST(att4 AS VARCHAR(MAX)) FROM cte
ORDER BY a, b

请注意，我正在将value列强制转换为

VARCHAR（MAX）

，因为我不知道表中有哪些数据类型。如果它们都是数字，则可以删除

CAST

函数

如果你只在一张桌子上做一次，那么这对你来说很好。但是，如果希望能够在各种表上执行此操作，可以让SQLServer为您编写代码。这里有一个程序可以做到这一点：

CREATE PROCEDURE usp_Coordinate_table(@TableName NVARCHAR(200)) AS
BEGIN
    DECLARE @sql NVARCHAR(MAX);
    WITH cte AS (SELECT TOP 1 c.name FROM sys.columns c, sys.objects o WHERE c.object_id = o.object_id AND o.name = @TableName)
    SELECT @sql = 'WITH RowData AS (SELECT ROW_NUMBER() OVER (ORDER BY '+name+') AS RowNum, * FROM '+@TableName+') ' FROM cte;

    WITH ColData AS (SELECT ROW_NUMBER() OVER (ORDER BY c.column_id) AS ColNum, c.name 
        FROM sys.columns c, sys.objects o WHERE c.object_id = o.object_id AND o.name = @TableName)
    SELECT @sql = @sql + 'SELECT RowNum, '+CAST(c.ColNum AS VARCHAR)+' AS ColNum, CAST('+c.name+' AS VARCHAR(MAX)) AS Value FROM RowData UNION ALL '
    FROM ColData c

    SET @sql = SUBSTRING(@sql, 1, LEN(@sql) - 10) + ' ORDER BY RowNum, ColNum'
    EXEC sp_executesql @sql
END

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您使用的是什么版本的sql server？