Question

如何使用select？

创建具有给定列名的临时表

我的意思是这样的（我把＆＃34;作为newData＆＃34;只是为了说明这个想法，这不起作用）：

 CREATE TEMPORARY TABLE IF NOT EXISTS tmp AS
 SELECT id, min(data) as newData FROM myTable WHERE id > 100 GROUP BY id;

所以我可以得到一个像这样的表：

+-------------------+------------------+------+-----+---------+-------+
| Field             | Type             | Null | Key | Default | Extra |
+-------------------+------------------+------+-----+---------+-------+
| id                | int(10) unsigned | NO   |     | 0       |       |
| newData           | int(10) unsigned | YES  |     | NULL    |       |
+-------------------+------------------+------+-----+---------+-------+

问题是，如果我直接创建表格，第二个字段名称包含禁用符号，我不知道如何使用它：

+-------------------+------------------+------+-----+---------+-------+
| Field             | Type             | Null | Key | Default | Extra |
+-------------------+------------------+------+-----+---------+-------+
| id                | int(10) unsigned | NO   |     | 0       |       |
| min(data)         | int(10) unsigned | YES  |     | NULL    |       |
+-------------------+------------------+------+-----+---------+-------+

Answer 1

as newData正如您所期望的那样工作;

mysql> CREATE TABLE myTable (
  id INT NOT NULL DEFAULT 0,
  data INT
);

mysql> CREATE TEMPORARY TABLE tmp AS
         SELECT id, min(data) as newData FROM myTable WHERE id > 100 GROUP BY id;

mysql> desc tmp;
+---------+---------+------+-----+---------+-------+
| Field   | Type    | Null | Key | Default | Extra |
+---------+---------+------+-----+---------+-------+
| id      | int(11) | NO   |     | 0       |       |
| newData | int(11) | YES  |     | NULL    |       |
+---------+---------+------+-----+---------+-------+
2 rows in set (0.01 sec)

如何使用select中的给定列名创建临时表？

1 个答案: