需要在 psql 中以特定格式输出

Question

假设：-

subh=# select 'test123';
          ?column?
-------------------------------------
         test123

和

subh=# select obj_description('test123'::regclass);
  obj_description
--------------------
 this is my table

我正在运行这个查询：-

subh=# select 'test123' || ' ' || obj_description('test123'::regclass) as test;
             test
 -------------------------------
  test123 this is my table

其实我希望输出如下：-

            test
-------------------------------
  test123 'this is my table'

Answer 1

使用quote_literal

此函数在给定字符串/数字的前后添加单引号。阅读here。

subh=# select 'test123' || ' ' || quote_literal(obj_description('test123'::regclass)) as test;

Answer 2

subh=# select 'test123' || ' \'' || obj_description('test123'::regclass) as test || '\'';

             test
 -------------------------------
  test123 'this is my table'

\' 将用于添加报价