在 Select 语句计算中使用列别名 Oracle SQL
是否可以做类似select 1 as foo, foo+1 from dual
这将在第 1 行返回 ERROR: ORA-00904: "FOO": invalid identifier
This returns ERROR at line 1: ORA-00904: "FOO": invalid identifier
我有一个组成一列的冗长计算,我希望能够轻松地使用该值在差异列中进行计算
I have a lengthy calculation that composes a column and I would like to be able to easily use that value for calculation in a difference column
推荐答案
不能直接使用别名.一种方法是使用派生表:
You can't use an alias directly. One way is to use a derived table:
SELECT foo, foo+1
FROM (SELECT 1 AS foo FROM dual) AS T
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