Mysql 如何在sql中使用SELECT和JOIN组合不同表的不同列？

我有三个表

表1、表2和表3

。在每个表中，我都有列

primaryKey（unsigned int）和name

。我试图使用

SELECT

语句进行查询，并获取包含表1的名称、表2的名称和表3的名称的表。到目前为止，我有以下代码：

SELECT Table1.name as Table1Name, Table2.name as Table2Name, Table3.name as Table3Name
from Table1 INNER JOIN table2 on 
table1.primaryKey = table2.primaryKey;

我得到这个错误：

Error 1054 (42S22): Unknown column 'Table3.name' in 'field list'

---

我可能有语法错误，但我似乎无法理解它！我有两张表要处理，但没有3张：（非常感谢您的帮助！！

您忘了在“FROM”子句中列出表3:

---

原因是您没有加入

表3

。您只加入

表1和
表2

SELECT Table1.name as Table1Name, Table2.name as Table2Name, Table3.name as Table3Name
from Table1 INNER JOIN table2 on 
table1.primaryKey = table2.primaryKey
INNER JOIN table3 on table2.primaryKey = table3.primaryKey;

您还必须对表3进行一次内部联接

SELECT Table1.name as Table1Name, Table2.name as Table2Name, Table3.name as Table3Name
from table1 INNER JOIN table2 on 
table1.primaryKey = table2.primaryKey INNER JOIN table3 on table1.primaryKey = table3.primaryKey;

您忘记了select查询中的表3

SELECT Table1.name as Table1Name, Table2.name as Table2Name, Table3.name as Table3Name
FROM Table1 INNER JOIN Table2 on Table1.primaryKey = Table2.primaryKey
INNER JOIN Table3 on Table1.primaryKey  = Table3.primaryKey;

或

SELECT Table1.name as Table1Name, Table2.name as Table2Name, Table3.name as Table3Name 
FROM Table1, Table2, Table3 WHERE table1.primaryKey = table2.primaryKey AND  
table1.primaryKey  = t3.primaryKey;

希望它能对您有所帮助。
from子句中没有表3。
删除表3.name或在join PART中添加表3第一次查询的语法无效，您不应该建议有人使用ANSI之前的语法。很抱歉键入错误。我现在更正了它。我知道我不知道语法是什么。这让我更明智e现在谢谢！@user2921302您只需添加另一个这样的表。如果您的主键都相同，则不需要指定所有3个“on”子句，只需指定2个。
SELECT Table1.name as Table1Name, Table2.name as Table2Name, Table3.name as Table3Name 
FROM Table1, Table2, Table3 WHERE table1.primaryKey = table2.primaryKey AND  
table1.primaryKey  = t3.primaryKey;