加入MySQL语法错误

我目前正在教导自己使用MySQL。问题是，自我教学并不总是那么容易，而且我经常陷入困境。通常，我试图让自己失去信心，但今天不是这样的日子。加入MySQL语法错误

我使用SQLFiddle（http://sqlfiddle.com/）针对数据库运行我的查询，直到找到一些更永久的软件解决方案。

我的问题是在我的查询。

(SELECT customer.customername, the_account.balance, branch.branch_name  
    FROM customer, has_account, the_account, branch 
    WHERE customer.ssn = has_account.assn 
    AND has_account.ano = the_account.accountno 
    AND the_account.branchid = branch.branchid) AS a 
JOIN 
(SELECT customer.customername, loan.amount, branch.branch_name 
    FROM customer, has_loan, loan, branch 
    WHERE customer.ssn = has_loan.lssn 
    AND has_loan.lno = loan.loanno 
    AND loan.branchid = branch.branchid) AS b 
ON has_account.assn = has_loan.lssn;

现在，我敢肯定，语法错误是非常明显的人谁知道由心脏SQL，但我只是固守成规，似乎并不能对自己掏了出来。

我的理解是我至少可以尝试像这样一起加入任意两张桌子。

有关我的数据库，查询等的完整概述，请转至http://sqlfiddle.com/#!2/1943b/85。

请，温柔。我知道这可能是一个菜鸟的错误，但是自己学习这些东西并不像你想象的那么容易。

UPDATE1：

所以尝试后建议：

(SELECT has_account.assn as assn, customer.customername, the_account.balance, branch.branch_name  
    FROM customer, has_account, the_account, branch 
    WHERE customer.ssn = has_account.assn 
    AND has_account.ano = the_account.accountno 
    AND the_account.branchid = branch.branchid) AS a 

JOIN 

(SELECT has_loan.lssn as lssn, customer.customername, loan.amount, branch.branch_name 
    FROM customer, has_loan, loan, branch 
    WHERE customer.ssn = has_loan.lssn 
    AND has_loan.lno = loan.loanno 
    AND loan.branchid = branch.branchid) AS b 

ON b.lssn = a.assn;

这看起来很不错，并制造了世界所有的意义，我，SQLFiddle抱怨：

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 'AS a JOIN (SELECT has_loan.lssn as lssn, customer.customername, loan.amount, bra' at line 5: (SELECT has_account.assn as assn, customer.customername, the_account.balance, branch.branch_name FROM customer, has_account, the_account, branch WHERE customer.ssn = has_account.assn AND has_account.ano = the_account.accountno AND the_account.branchid = branch.branchid) AS a JOIN (SELECT has_loan.lssn as lssn, customer.customername, loan.amount, branch.branch_name FROM customer, has_loan, loan, branch WHERE customer.ssn = has_loan.lssn AND has_loan.lno = loan.loanno AND loan.branchid = branch.branchid) AS b ON b.lssn = a.assn

（以防万一有人想要完整的错误报告！）

来源

2014-10-20 ViRALiC

MySQL不支持FULL OUTER JOIN。你必须用LEFT JOIN和RIGHT JOIN进行模拟。 – 2014-10-20 07:43:35

JOIN类型并不真正困扰着我。这就是没有任何表格（A和B）会加入我似乎做的任何事情。 – ViRALiC 2014-10-20 07:47:33

试试这个（MySQL的没有完全连接） http://stackoverflow.com/questions/4796872/full-outer-join-in-mysql – 2014-10-20 07:48:31

select * from 
(SELECT has_account.assn as assn, customer.customername, the_account.balance, branch.branch_name  
    FROM customer, has_account, the_account, branch 
    WHERE customer.ssn = has_account.assn 
    AND has_account.ano = the_account.accountno 
    AND the_account.branchid = branch.branchid) AS a 
JOIN 
(SELECT has_loan.lssn as lssn, customer.customername, loan.amount, branch.branch_name 
    FROM customer, has_loan, loan, branch 
    WHERE customer.ssn = has_loan.lssn 
    AND has_loan.lno = loan.loanno 
    AND loan.branchid = branch.branchid) AS b 
ON b.lssn = a.assn;

个人而言，我不喜欢这样的连接，你可以尝试用简单的方式（IM不知道加入的条件是正确的，请检查）：

SELECT 
    customer.customername, 
    the_account.balance, 
    branch.branch_name, 
    loan.amount 
FROM customer 
JOIN has_account on has_account.assn = customer.ssn 
JOIN the_account on the_account.accountno = has_account.ano 
JOIN branch on branch.branchid = the_account.branchid 
JOIN has_loan on has_loan.lssn = customer.ssn 
JOIN loan on loan.loanno = has_loan.lno;

来源

2014-10-20 07:48:43

不起作用。仍然抛出一个语法错误：http://sqlfiddle.com/#!2/1943b/89 – ViRALiC 2014-10-20 07:49:49

这看起来像一个很好的回答这个问题，你可能更新你的答案与解释虽然吗？ OP显然是在学习，只是一个答案不会帮助他的学习太多... – HoneyBadger 2014-10-20 07:50:43

@ViRALiC更新。错过选择* – 2014-10-20 07:53:38

加入MySQL语法错误

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