Oracle:如何在比较操作中使用子查询中的空格引用别名

Question

有没有办法在Oracle SQL查询中引用其中包含空格的别名？我还没有在任何地方找到它.通常我不使用空格来命名数据库元素,所以这对我来说是个新的基础.

这是一个示例查询:

SELECT  t.id AS "Ticket ID",
(SELECT w.workgroup_title FROM workgroups w
WHERE w.operator_id = t.operator_id AND ROWNUM < 2) AS "Workgroup Title"
FROM tickets t

如何在未来的比较操作中使用"Ticket ID"或"Workgroup Title"？例如:

"票证ID"== 9或"工作组标题"=='工作组#1'

我猜这是一个简单的方法,但还没有找到它.

谢谢!

PS这是传给我的遗产.SQL中的别名动态地绑定到其他各种代码中,并且都有空格.因此,删除空格并不是一件简单的事情,我目前还没有预算好时间.否则,这就是我要做的.

编辑澄清
使用上面的示例,如何在"工作组标题"始终引用别名的情况下执行此类操作:

SELECT  t.id AS "Ticket ID",
(SELECT w.workgroup_title FROM workgroups w
WHERE w.operator_id = t.operator_id AND ROWNUM < 2) AS "Workgroup Title",
(SELECT s.support_tier_id FROM support_tiers s
WHERE s.workgroup_title == "Workgroup Title") AS "Support Tier ID"
FROM tickets t

Answer 1

是的,你可以这样做,但你必须用双引号括起这些名字:

-- SQL Example
SELECT "Just one" FROM (
  SELECT 1 AS "Just one" FROM dual
);

输出:

  Just one
----------
         1 

-- PL/SQL Example
BEGIN
  FOR v_rec IN (SELECT 1 AS "Just one" FROM dual)
  LOOP
    dbms_output.put_line(v_rec."Just one");
  END LOOP;
END;
/

输出:

1

还有一点好奇心:

BEGIN
  FOR v_rec IN (SELECT COUNT(1) * 10 FROM dual)
  LOOP
    dbms_output.put_line(v_rec."COUNT(1)*10");
  END LOOP;
END;

这适用..并打印:

10

编辑

您可以在查询的其他位置引用别名列,例如:

SELECT 'It is just one' FROM (
  SELECT "Just one" FROM (
    SELECT 1 AS "Just one" FROM dual
  ) t
WHERE t."Just one" = 1 -- prefixing with t. is not necessary in this particular example
);

输出:

It is just one