如何在Oracle中编写表格文字？

Question

可以使用以下命令创建包含一列和一行的表:

select 'create' as col from dual;

这可以用于构建表连接:

with
  a as (select 'create' as ac from dual),
  b as (select 'delete' as bc from dual)
select * from a left outer join b on (ac = bc);

现在我想要两行.我是这样做的:

select 'create' as col from dual
union
select 'delete' as col from dual;

但是有一个更紧凑的符号吗？我试过了

select ('create', 'delete') as col from dual;

但它不起作用.

Answer 1

例如,您可以使用集合类型和TABLE运算符(适用于Oracle 10g):

SQL> SELECT column_value FROM TABLE(SYS.ODCIVARCHAR2LIST('abc', 'def', 'ghi'));

COLUMN_VALUE
--------------------------------------------------------------------------------
abc
def
ghi