MySQL:删除左连接上的重复列,3个表

Question

我有一个表使用3个外键到其他表.当我执行左连接时,我得到重复的列.MySQL表示USING语法将减少重复列,但没有多个键的示例.

鉴于:

mysql> describe recipes;
+------------------+------------------+------+-----+---------+-------+
| Field            | Type             | Null | Key | Default | Extra |
+------------------+------------------+------+-----+---------+-------+
| ID_Recipe        | int(11)          | NO   | PRI | NULL    |       |
| Recipe_Title     | char(64)         | NO   |     | NULL    |       |
| Difficulty       | int(10) unsigned | NO   |     | NULL    |       |
| Elegance         | int(10) unsigned | NO   |     | NULL    |       |
| Quality          | int(10) unsigned | NO   |     | NULL    |       |
| Kitchen_Hours    | int(10) unsigned | NO   |     | NULL    |       |
| Kitchen_Minutes  | int(10) unsigned | NO   |     | NULL    |       |
| Total_Hours      | int(10) unsigned | NO   |     | NULL    |       |
| Total_Minutes    | int(10) unsigned | NO   |     | NULL    |       |
| Serving_Quantity | int(10) unsigned | NO   |     | NULL    |       |
| Description      | varchar(128)     | NO   |     | NULL    |       |
| ID_Prep_Text     | int(11)          | YES  |     | NULL    |       |
| ID_Picture       | int(11)          | YES  |     | NULL    |       |
| Category         | int(10) unsigned | NO   |     | NULL    |       |
| ID_Reference     | int(11)          | YES  |     | NULL    |       |
+------------------+------------------+------+-----+---------+-------+
15 rows in set (0.06 sec)

mysql> describe recipe_prep_texts;
+------------------+---------------+------+-----+---------+-------+
| Field            | Type          | Null | Key | Default | Extra |
+------------------+---------------+------+-----+---------+-------+
| ID_Prep_Text     | int(11)       | NO   | PRI | NULL    |       |
| Preparation_Text | varchar(2048) | NO   |     | NULL    |       |
+------------------+---------------+------+-----+---------+-------+
2 rows in set (0.02 sec)

mysql> describe recipe_prep_texts;
+------------------+---------------+------+-----+---------+-------+
| Field            | Type          | Null | Key | Default | Extra |
+------------------+---------------+------+-----+---------+-------+
| ID_Prep_Text     | int(11)       | NO   | PRI | NULL    |       |
| Preparation_Text | varchar(2048) | NO   |     | NULL    |       |
+------------------+---------------+------+-----+---------+-------+
2 rows in set (0.02 sec)

mysql> describe mp_references;
+--------------+---------+------+-----+---------+-------+
| Field        | Type    | Null | Key | Default | Extra |
+--------------+---------+------+-----+---------+-------+
| ID_Reference | int(11) | NO   | PRI | NULL    |       |
| ID_Title     | int(11) | YES  |     | NULL    |       |
| ID_Category  | int(11) | YES  |     | NULL    |       |
+--------------+---------+------+-----+---------+-------+
3 rows in set (0.00 sec)

我的查询声明:

SELECT  *
 FROM  Recipes
LEFT JOIN (Recipe_Prep_Texts, Recipe_Pictures, mp_References)
ON (
 Recipe_Prep_Texts.ID_Prep_Text = Recipes.ID_Prep_Text AND
 Recipe_Pictures.ID_Picture = Recipes.ID_Picture AND
 mp_References.ID_Reference = Recipes.ID_Reference
);

我的目标是从连接中获取所有列的一行而不使用重复列.我正在使用MySQL C++ Connector发送SQL语句并检索结果集.我相信C++连接器存在重复列名称的问题.

那么我应该使用的SQL语句语法是什么？

参考MySQL JOIN语法

Answer 1

我认为以下应该有效:

SELECT  *
 FROM  Recipes
LEFT JOIN Recipe_Prep_Texts USING (ID_Prep_Text)
LEFT JOIN Recipe_Pictures USING (ID_Picture)
LEFT JOIN mp_References USING (ID_Reference)