如何在sqlplus中使用替代变量？ IN条件

Question

当我实际使用 & 号作为输入时遇到错误，它不返回记录

当我对名称进行硬编码时，它能够显示记录。 例如，我输入的名称是“customer something”，中间有一个空格。

是否与输入无法接受空间有关？ 那么如何解决返回IN里面的记录呢？

WHERE
    name IN ('&name');

Answer 1

出现提示时引用替换字符串，不要在查询本身中引用替换文本。

SQL> select &message from dual;
Enter value for message: hello mom
old   1: select &message from dual
new   1: select hello mom from dual
select hello mom from dual
       *
ERROR at line 1:
ORA-00904: "HELLO": invalid identifier


SQL> select &message from dual;
Enter value for message: 'Hello, Mom!'
old   1: select &message from dual
new   1: select 'Hello, Mom!' from dual

'HELLO,MOM!
-----------
Hello, Mom!

SQL> create table so_ampersand (message varchar2(20));

Table created.

SQL> insert into so_ampersand values ('Hello, Mom!');

1 row created.

SQL> commit;

Commit complete.

SQL> select * from so_ampersand where message in (&mess);
Enter value for mess: 'Hello, Mom!'
old   1: select * from so_ampersand where message in (&mess)
new   1: select * from so_ampersand where message in ('Hello, Mom!')

MESSAGE
--------------------
Hello, Mom!

SQL> 

或者，反过来。。

SQL> select * from so_ampersand where message in ('&mess2');
Enter value for mess2: Hello, Mom!
old   1: select * from so_ampersand where message in ('&mess2')
new   1: select * from so_ampersand where message in ('Hello, Mom!')

MESSAGE
--------------------
Hello, Mom!