mysql - 如何在 mySQL 中创建一个空的 VIEW

Question

我正在尝试使用我定义的列在 mySQL 中创建一个空的 VIEW。

即我想要一个包含以下列的 View :年龄、身份证、性别，但有 0 行。

提前致谢。

Answer 1

给你举个例子:

mysql> create or replace view v_test as 
    -> select 99 as age, 
    ->   2147483647 as id, 
    ->   'F' as gender 
    -> from dual 
    -> where false;
Query OK, 0 rows affected (0.04 sec)

mysql> desc v_test;
+--------+------------+------+-----+---------+-------+
| Field  | Type       | Null | Key | Default | Extra |
+--------+------------+------+-----+---------+-------+
| age    | int(2)     | NO   |     | 0       |       |
| id     | bigint(10) | NO   |     | 0       |       |
| gender | varchar(1) | NO   |     |         |       |
+--------+------------+------+-----+---------+-------+
3 rows in set (0.01 sec)

mysql> select * from v_test;
Empty set (0.00 sec)