使用自定义列名称（使用AS）在select子句中的子查询中选择列（两列）

Question

选择子句中带有自定义列名称（使用AS）的子查询中的选择列（两列）。

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Answer 1

将子查询包装在CTE中并交叉连接到表：

WITH cte AS (
  SELECT column1 AS c, column2 AS d
  FROM table1
  WHERE COLUMN_NAME = (SELECT MAX(COLUMN_NAME) FROM table1)
)
SELECT t3.a, t3.b, t.c, t.d
FROM table3 t3 CROSS JOIN cte t