如何将多个表连接在一起

Question

我正在尝试将多个 table 连接在一起，但我似乎做不对。我得到的错误是：

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '.egr_name = egr.name
            JOIN dirEgr
                dirEgr' at line 4

我的 SQL 语法如下

SELECT egr.*, carEgr.*, dirEgr.*, egrEmp.*, emp.*, boss.*, asoci.*, snip.*, pro.*
            FROM egr 
            JOIN carEgr
                carEgr.egr_name = egr.name
            JOIN dirEgr
                dirEgr.egr_name = egr.name
            JOIN egrEmp
                egrEmp.egr_name = egr.name
            JOIN emp
                emp.idEmp = egrEmp.emp_idEmp
            JOIN boss
                boss.emp_idEmp = emp.idEmp
            JOIN asosi
                asoci.egr_name = egr.name
            JOIN snip
                snip.egr_name = egr.name
            JOIN pro
                pro.egr_name = egr.name

egr_name 是大多数 table 的主键，emp 和 boss 除外。另外，如何将 boss 连接到 egr table 或 egr_name 主键？我的 table 是：

egr
name

carEgr
egr_name //primary foreign key from egr table
idCarEgr //primary key
nameCarEgr

dirEgr
idDirEgr //primary key
egr_name //primary foreign key from egr table
nameDirEgr

egrEmp
emp_idEmp //primary key
egr_name //primary foreign key from egr table
nameEmp

emp
idEmp //primary key
nameEmp

boss
idBoss //primary key
emp_idEmp //primary foreign key from emp table
nameBoss

snip
idSNIP //primary key
egr_name //primary foreign key from egr table
nameSNIP

asoci
idAsoci //primary key
egr_name //primary foreign key from egr table
nameAsoci

pro
idPro //primary key
egr_name //primary foreign key from egr table
namePro

Answer 1

您缺少 JOINS

的 ON 子句

SELECT egr.*, carEgr.*, dirEgr.*, egrEmp.*, emp.*, boss.*, asoci.*, snip.*, pro.*
FROM egr 
JOIN carEgr
   ON carEgr.egr_name = egr.name
JOIN dirEgr
   ON dirEgr.egr_name = egr.name
JOIN egrEmp
    ON egrEmp.egr_name = egresado.name
JOIN emp
    ON emp.idEmp = egrEmp.emp_idEmp
JOIN boss
    ON boss.emp_idEmp = emp.idEmp
JOIN asosi
   ON asoci.egr_name = egr.name
JOIN snip
   ON snip.egr_name = egr.
JOIN pro
    ON pro.egr_name = egr.name

Answer 2

egrEmp.egr_name = egresado.name

egresado 的参考资料在哪里。这没有定义。除了上述评论外，更改此和运行您的查询。

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