对SQL oracle中的特定列使用select with select语句

Question

假设我有一个名为INFO的下表:

NAME   CITY                PROFESSION
A      New-Mexico          Software-Developer
B      Tampa               Software-Analyst

我只希望用'/'替换PROFESSION列中的" - ".什么应该是显示表INFO的所有内容的查询,具有上述变化？

我试过了 :

SELECT REPLACE(PROFESSION,'-','/') , * from INFO;

但这不起作用.

Answer 1

如果SELECT列表中有任何其他列,则不能使用纯星号(*).您必须使用表名或别名:

SELECT REPLACE(PROFESSION,'-','/') , info.* from INFO;

我猜你想要的是:

SELECT name, city, REPLACE(PROFESSION,'-','/') AS profession FROM info;

测试:

CREATE TABLE info (
  name VARCHAR2(20),
  city VARCHAR2(20),
  profession VARCHAR2(20)
);

INSERT INTO info VALUES ('A', 'New-Mexico', 'Software-Developer');
INSERT INTO info VALUES ('B', 'Tampa', 'Software-Analyst');

COMMIT;

SELECT name, city, REPLACE(PROFESSION,'-','/') AS profession FROM info;

输出:

NAME                 CITY                 PROFESSION         
-------------------- -------------------- --------------------
A                    New-Mexico           Software/Developer   
B                    Tampa                Software/Analyst

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