mysql - Microsoft SQL 如何从行构造表

Question

我有一个包含 GUID 列表的 cte，例如

WITH CTE AS (从 TableOne 中选择 GUID) SELECT * FROM CTE

对于每个 GUID，我都有一个函数，它以格式返回一个表

1. 第 1 行
2. 第 2 行
3. 第 3 行

我如何将结果组合到新的 cte 表中，例如

Guid Row1 Row2 Row3？

比

Answer 1

您可以使用条件聚合——如果您知道列数：

WITH CTE AS (
      Select GUID, ROW_NUMBER() OVER (ORDER BY GUID) as seqnum
      FROM TableOne
     )
SELECT MAX(CASE WHEN seqnum = 1 THEN GUID END) as GUID_1,
       MAX(CASE WHEN seqnum = 2 THEN GUID END) as GUID_2,
       MAX(CASE WHEN seqnum = 3 THEN GUID END) as GUID_3       
FROM CTE;