Php 将两个mysql查询连接在一起

我想在一个查询中得到以下两个查询。我试过了，但没能成功，你能帮帮我吗

提前感谢：）

查询：1

" SELECT * FROM vouchers 
LEFT JOIN details on vouchers.voucher_no = details.voucher_no 
LEFT JOIN   accounts on accounts.code = details.t_code 
     WHERE (voucher_type='1' AND account_code='1001')
        OR (voucher_type='0' AND t_code='1001')
        OR (voucher_type='0' AND account_code='1001')"

查询：2

"SELECT * FROM details 
LEFT JOIN vouchers on details.voucher_no = vouchers.voucher_no 
LEFT JOIN accounts on accounts.code = vouchers.account_code 
    WHERE (voucher_type='1' AND account_code='1001') 
       OR (voucher_type='0' AND t_code='1001') 
       OR (voucher_type='0' AND account_code='1001')"

我尝试了以下操作，但收到一条错误消息，表明我的SQL语法有错误

 $getData = $this->db->query("SELECT * FROM vouchers 
 LEFT JOIN details on vouchers.voucher_no = details.voucher_no 
 LEFT JOIN   accounts on accounts.code = details.t_code 
     WHERE (voucher_type='1' AND account_code='1001')
        OR (voucher_type='0' AND t_code='1001')
        OR (voucher_type='0' AND account_code='1001'), <<I just separated with a comma

SELECT * FROM details 
LEFT JOIN vouchers on details.voucher_no = vouchers.voucher_no 
LEFT JOIN accounts on accounts.code = vouchers.account_code 
    WHERE (voucher_type='1' AND account_code='1001') 
       OR (voucher_type='0' AND t_code='1001') 
       OR (voucher_type='0' AND account_code='1001')");

if($getData->num_rows() > 0)
return $getData->result_array();
else
return null;
}

$getData=$this->db->query（“从凭证中选择*
凭证上的左联接详细信息。凭证号=详细信息。凭证号
在accounts.code=details.t\u code上左加入帐户
其中（凭证类型='1'和科目代码='1001'）
或（凭证类型为“0”且t\U代码为“1001”）
或者（凭证类型='0'和账户代码='1001'），将它们与UNION ALL连接起来

 $getData = $this->db->query("SELECT * FROM vouchers 
 LEFT JOIN details on vouchers.voucher_no = details.voucher_no 
 LEFT JOIN   accounts on accounts.code = details.t_code 
     WHERE (voucher_type='1' AND account_code='1001')
        OR (voucher_type='0' AND t_code='1001')
        OR (voucher_type='0' AND account_code='1001')

UNION ALL

SELECT * FROM details 
LEFT JOIN vouchers on details.voucher_no = vouchers.voucher_no 
LEFT JOIN accounts on accounts.code = vouchers.account_code 
    WHERE (voucher_type='1' AND account_code='1001') 
       OR (voucher_type='0' AND t_code='1001') 
       OR (voucher_type='0' AND account_code='1001')");

您想如何加入它们？您是在谈论内部加入吗？您想在哪个字段上加入它们？看起来您想在详细信息和凭证之间进行外部加入。您可能可以将其重写为单个查询（例如，
SELECT*FROM details，dictions…
），但如果没有，则始终存在全部联合。